[Bug]: 3.15.3 Multiple Repeated Unresolvable Conflicts

### ⚠️ Before submitting, please verify the following: ⚠️

- [x] This is a **bug**, not a question or a configuration issue.
- [x] This issue is **not** already reported on Github (I've searched it).
- [x] Nextcloud Server and Desktop Client are **up to date**. See [Server Maintenance and Release Schedule](https://github.com/nextcloud/server/wiki/Maintenance-and-Release-Schedule) and [Desktop Releases](https://nextcloud.com/install/#install-clients) for supported versions.
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/)

### Bug description

I am getting repeated "unresolved conflicts". When I select "Click for details" the same file shows multiple conflicts. Furthermore, when I select "[/] All local versions" and "[Resolve conflicts]", more conflicts keep recurring.

The same fault is happening on different files, different sync folders, and different clients (all Windows 10). What appears to be common is that the files affected are "in use" and frequently updated.

The conflicts arise when only one client is active, so the conflict is false, it is a bug somewhere in nextcloud.

Although many files are affected and multiple conflicts arise for any one file, for simplicity, the following
information relates to just one file `Inbox` with just one conflict on a file which changed on 2025-01-16 in the timeframe between 11:30 and 11:39.

From a linux machine, I am able to access the Windows client via a cifs mount, and an `ls -l --full-date` reveals:
```
-rw-rw-r-- 1 apache apache 4719510 2025-01-16 11:34:15.000000000 +0000 /mnt/veriulan/d/Data/BobW/AppData/Roaming/Thunderbird/Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox
-rw-rw-r-- 1 apache apache 4719510 2025-01-16 11:34:22.649039900 +0000 /mnt/veriulan/d/Data/BobW/AppData/Roaming/Thunderbird/Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox (conflicted copy 2025-01-16 113422)
-rw-r--r-- 1 apache apache 4719510 2025-01-16 11:34:15.000000000 +0000 /srv/gluvol1/vault/bobw/files/BobW/AppData/Roaming/Thunderbird/Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox
```
which are the client file, the conflicted file and the server file respectively.

The client file and server file are identical. The conflicted file differs:
```
71151c71151
< X-Mozilla-Status: 0001
---
> X-Mozilla-Status: 0009
```

Details from the corresponding "Solve sync conflicts" dialog box
```
Inbox
Local Version Server Version
Thu Jan 16 11:34:22:2025 Thu Jan 16 11:34:15:2025
4.50MiB 4.50MiB
```
The mtime in the server database is 7 seconds older than the mtime on the server file.


The client log in the stated timeframe contains:
```
#=#=#=# Syncrun started 2025-01-16T11:33:40Z
#=#=#=#=# Propagation starts 2025-01-16T11:33:42Z (last step: 1337 msec, total: 1337 msec)
11:33:41||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox|64|2|1737027215|860b186e1aaaffc487648b8dcac0be73|4719510|17786730oc3hd6f2u8cw|13||200|4719510|1737027215|7196e852-4863-433e-865a-3eb7f6e1129d|
11:33:42||Profiles/rdvpq1tu.default/permissions.sqlite|64|1|1737027217|03360863d89d23ecf41ce48f8feaa11a|130048|04504266oc3hd6f2u8cw|13||204|130048|1737026720|dc876a59-2f63-4c4b-92f9-79b40c429455|
#=#=#=# Syncrun finished 2025-01-16T11:33:42Z (last step: 543 msec, total: 1880 msec)
#=#=#=# Syncrun started 2025-01-16T11:33:45Z
#=#=#=#=# Propagation starts 2025-01-16T11:33:46Z (last step: 990 msec, total: 990 msec)
#=#=#=# Syncrun finished 2025-01-16T11:33:46Z (last step: 167 msec, total: 1158 msec)
#=#=#=# Syncrun started 2025-01-16T11:34:18Z
#=#=#=#=# Propagation starts 2025-01-16T11:34:19Z (last step: 717 msec, total: 717 msec)
11:34:19||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox.msf|64|1|1737027255|668f92cfd3fc55a5338d376546c0e1d0|7775|17482571oc3hd6f2u8cw|13||204|7699|1737027215|bfba898d-07fd-4591-8038-258a68f9489d|
11:34:19||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Trash.msf|64|1|1737027255|6bb6ed7d88946ea930ea69989a26190f|980268|11171205oc3hd6f2u8cw|13||204|979300|1737023830|723a7244-8626-4153-9c97-0c5fff5492de|
11:34:19||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox|64|1|1737027255|812ccdd2b6c6fc5c6a4e68e795f1b250|4719510|04504918oc3hd6f2u8cw|13||204|4719510|1737027215|8f180ed7-ab44-4353-8134-1b2c22b52c9a|
11:34:19||Profiles/rdvpq1tu.default/Mail/smart mailboxes-1/Trash.msf|64|1|1737027255|6d2746b1cfcdcf532f1bf9ca5560f4b2|1667|13611975oc3hd6f2u8cw|13||204|1618|1737023830|1fbc6aed-7b92-4a50-b76e-fedc252bba54|
11:34:19||Profiles/rdvpq1tu.default/Mail/smart mailboxes-1/Inbox.msf|64|1|1737027255|aa33aec9a4ee61675d07890acad15b62|2028|13611967oc3hd6f2u8cw|13||204|1990|1737027215|424d7ef9-3dcf-4d21-be13-feac18fa5570|
11:34:23||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Trash|64|1|1737027255|9af38e77e390ee3f5f81b762c71181e4|138852413|04504919oc3hd6f2u8cw|13||204|138769046|1737023488|6838bdc3-fe97-497f-a5ca-3fff0c9a7932|
#=#=#=# Syncrun finished 2025-01-16T11:34:26Z (last step: 7289 msec, total: 8006 msec)
#=#=#=# Syncrun started 2025-01-16T11:34:31Z
#=#=#=#=# Propagation starts 2025-01-16T11:34:32Z (last step: 1323 msec, total: 1323 msec)
11:34:32||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox.msf|64|1|1737027262|b5f9b3f2b7024eb7b16a81d4abb88949|8258|17482571oc3hd6f2u8cw|13||204|7775|1737027255|7acfdab3-7647-49f3-bb04-7e764c2ff529|
11:34:32||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/PC.sbd/Norton Symantec.msf|64|1|1737027269|c1aa7acb7cc7bb7ab5efb732b2b5ad8c|166160|11500057oc3hd6f2u8cw|13||204|165197|1737026715|f96f70d4-999e-4db4-98cb-15f43b168c4d|
11:34:33||Profiles/rdvpq1tu.default/Mail/smart mailboxes-1/Inbox.msf|64|1|1737027262|5d776ce1edfa2f14d024b7203dc4ebf0|1398|13611967oc3hd6f2u8cw|13||204|2028|1737027255|330a6b79-1c78-4937-9585-53a7e8678474|
11:34:32||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/PC.sbd/Norton Symantec|64|1|1737027262|3a5a9136dbfcaa1c6a2b7d5d49d87e64|16935828|11500026oc3hd6f2u8cw|13||204|16902187|1737026702|4a4dc003-5d63-4f61-86d0-9d4e655698ce|
11:34:33||Profiles/rdvpq1tu.default/prefs.js|64|1|1737027263|3f61d7775680ee8a372dd5b41e0e25cd|51240|17482511oc3hd6f2u8cw|13||204|51255|1737026921|e90c4c7e-6558-470d-9ec5-927f7d30d2f6|
#=#=#=# Syncrun finished 2025-01-16T11:34:33Z (last step: 979 msec, total: 2302 msec)
#=#=#=# Syncrun started 2025-01-16T11:34:36Z
#=#=#=#=# Propagation starts 2025-01-16T11:34:38Z (last step: 1516 msec, total: 1516 msec)
||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox|64|2|1736892206|698442629fed2122005c6d38c2dcd314|61947904|17786730oc3hd6f2u8cw|2|We received a different E-Tag for resuming. Retrying next time.|200|4719510|1737027255|23f1aad1-2fdb-46c7-8075-05f2452b6ecc|
#=#=#=# Syncrun finished 2025-01-16T11:34:38Z (last step: 227 msec, total: 1743 msec)
#=#=#=# Syncrun started 2025-01-16T11:34:50Z
#=#=#=#=# Propagation starts 2025-01-16T11:34:51Z (last step: 1344 msec, total: 1344 msec)
#=#=#=# Syncrun finished 2025-01-16T11:34:52Z (last step: 195 msec, total: 1539 msec)
#=#=#=# Syncrun started 2025-01-16T11:35:17Z
#=#=#=#=# Propagation starts 2025-01-16T11:35:18Z (last step: 1318 msec, total: 1318 msec)
11:35:18||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox|64|2|1737027255|812ccdd2b6c6fc5c6a4e68e795f1b250|4719510|17786730oc3hd6f2u8cw|13||200|4719510|1737027255|1dcdebc1-ca6d-4fe2-807e-da1632658d6d|
11:35:18||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox.msf|64|1|1737027304|5fb47295bc9cdf82b037151b6770804e|8740|17482571oc3hd6f2u8cw|13||204|8258|1737027262|9ade5f3b-fd48-4ccc-88a4-1283836ec058|
11:35:18||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/PC.sbd/Norton Symantec.msf|64|1|1737027304|d25fe712eb9d48ebdedcc64824347d2b|166204|11500057oc3hd6f2u8cw|13||204|166160|1737027269|f8581162-1ca5-4406-b8ac-d6327381ec3b|
#=#=#=# Syncrun finished 2025-01-16T11:35:18Z (last step: 468 msec, total: 1786 msec)
#=#=#=# Syncrun started 2025-01-16T11:35:21Z
#=#=#=#=# Propagation starts 2025-01-16T11:35:22Z (last step: 1561 msec, total: 1561 msec)
||Profiles/rdvpq1tu.default/Mail/pop3.blueyonder.co.uk/Inbox|64|2|1736892206|698442629fed2122005c6d38c2dcd314|61947904|17786730oc3hd6f2u8cw|2|We received a different E-Tag for resuming. Retrying next time.|200|4719510|1737027255|680a46c5-53e4-46eb-a0ba-13ffb5f67b3f|
#=#=#=# Syncrun finished 2025-01-16T11:35:23Z (last step: 378 msec, total: 1940 msec)
#=#=#=# Syncrun started 2025-01-16T11:35:35Z
#=#=#=#=# Propagation starts 2025-01-16T11:35:36Z (last step: 1355 msec, total: 1355 msec)
#=#=#=# Syncrun finished 2025-01-16T11:35:37Z (last step: 200 msec, total: 1556 msec)
#=#=#=# Syncrun started 2025-01-16T11:35:43Z
#=#=#=#=# Propagation starts 2025-01-16T11:35:44Z (last step: 1230 msec, total: 1230 msec)
#=#=#=# Syncrun finished 2025-01-16T11:35:44Z (last step: 180 msec, total: 1410 msec)
```

### Steps to reproduce

1. Run nextcloud client as normal
2. Ensure all other clients are disconnected or with synchronisation paused
3. Continue accessing files as normal
4. Observe multiple unrsolved conflicts that keep recurring.

### Expected behavior

There should never be any conflicts when only one client is active.

### Which files are affected by this bug

Inbox

### Operating system

Windows

### Which version of the operating system you are running.

Windows 10

### Package

Official Windows MSI

### Nextcloud Server version

Nextcloud Hub 9 (30.0.4)

### Nextcloud Desktop Client version

3.15.3

### Is this bug present after an update or on a fresh install?

Updated from a minor version (ex. 3.4.2 to 3.4.4)

### Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

### Are you using an external user-backend?

- [x] Default internal user-backend
- [ ] LDAP/ Active Directory
- [ ] SSO - SAML
- [ ] Other

### Nextcloud Server logs

```shell
The server log in this timeframe contains:

awk '/2025-01-16T11:3/{gsub(/:/,"\n :");print " ",$0,"\n"}' /srv/gluvol1/vault/nextcloud.log
{"reqId"
:"a2YvtomEuIFRRcKcYiOC","level"
:2,"time"
:"2025-01-16T11
:30
:01+00
:00","remoteAddr"
:"","user"
:"--","app"
:"files","method"
:"","url"
:"--","message"
:"User admin still has unscanned files after running background scan, background scan might be stopped prematurely","userAgent"
:"--","version"
:"30.0.4.1","data"
:{"app"
:"files"}}

{"reqId"
:"EoFnW0VZibRGe3TK9qpo","level"
:2,"time"
:"2025-01-16T11
:35
:01+00
:00","remoteAddr"
:"","user"
:"--","app"
:"files","method"
:"","url"
:"--","message"
:"User admin still has unscanned files after running background scan, background scan might be stopped prematurely","userAgent"
:"--","version"
:"30.0.4.1","data"
:{"app"
:"files"}}

Both of these messages, I believe, are unrelated the false conflicts.
```

### Additional info

Other conflicts: