Windows client sync issues with VFS - some folders not working - NC client 33.0.x and 34.0.3

### ⚠️ 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 have searched for 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

We are activating/installing NC Client with an existing User (and files) on a Windows Workstation, inital Sync (VFS) is working but some time afterwards files and folders go missing or Windows errors out when traversing specific folders.
Files are there on the server and intact.
Only fix is to delete the hidden database file on the client to re-trigger the complete sync.
We have also downgraded the client to 4.0.8 since we did not see the behavior there.

### Steps to reproduce

1. have existing user
2. install NC Client 33.0.x or 34.0.3
3. Start sync with VFS enabled
4. Sync completes
5. After X amount of time, some folders are broken and some files go missing - i.e. folder Novigrad

### Expected behavior

Once a sync is done, VFS should work and all files should be visible, no errors when browsing directories

### Which files are affected by this bug

Novigrad

### Operating system

Windows

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

Win11 25H2 Build 26200.9457

### Installation method

Official Windows MSI

### Nextcloud Server version

33.0.6.2

### Nextcloud Desktop Client version

34.0.3

### Did this occur after an update or on a clean installation?

Clean desktop client installation

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

No

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

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

### Nextcloud Server logs

```shell
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/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php(239): OC\\Authentication\\Token\\PublicKeyTokenProvider->atomic(Object(Closure), Object(OC\\DB\\ConnectionAdapter))\\n#4 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/Manager.php(160): OC\\Authentication\\Token\\PublicKeyTokenProvider->renewSessionToken('djfs0ecqa8bn1a7...', 'q5q0rdbanu05v8e...')\\n#5 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/User/Session.php(912): OC\\Authentication\\Token\\Manager->renewSessionToken('djfs0ecqa8bn1a7...', 'q5q0rdbanu05v8e...')\\n#6 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php(1239): OC\\User\\Session->loginWithCookie('522-58petritz-A...', 'PnVbbtNCbMjmJvd...', 'djfs0ecqa8bn1a7...')\\n#7 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php(1125): OC::handleLogin(Object(OC\\AppFramework\\Http\\Request))\\n#8 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/index.php(25): OC::handleRequest()\\n#9 {main}\"}","CustomMessage":"Renewing session token failed: "}}
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{"reqId":"u7JILzExSnbKYv7jR5Ch","level":3,"time":"2026-09-14T08:27:55+02:00","remoteAddr":"77.220.111.18","user":"--","app":"core","method":"GET","url":"/","scriptName":"/index.php","message":"Renewing session token failed: ","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.36","version":"33.0.6.2","exception":{"Exception":"OC\\Authentication\\Exceptions\\ExpiredTokenException","Message":"","Code":0,"Trace":[{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php","line":177,"function":"checkToken","class":"OC\\Authentication\\Token\\PublicKeyTokenProvider","type":"->","args":[{"__class__":"OC\\Authentication\\Token\\PublicKeyToken","id":111629215}]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php","line":240,"function":"getToken","class":"OC\\Authentication\\Token\\PublicKeyTokenProvider","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/public/AppFramework/Db/TTransactional.php","line":45,"function":"OC\\Authentication\\Token\\{closure}","class":"OC\\Authentication\\Token\\PublicKeyTokenProvider","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php","line":239,"function":"atomic","class":"OC\\Authentication\\Token\\PublicKeyTokenProvider","type":"->","args":[{"__class__":"Closure"},{"__class__":"OC\\DB\\ConnectionAdapter"}]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/Manager.php","line":160,"function":"renewSessionToken","class":"OC\\Authentication\\Token\\PublicKeyTokenProvider","type":"->","args":["*** sensitive parameters replaced ***","dpsm2nbqrltei7ublghgi7vd9noau6ti"]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/User/Session.php","line":912,"function":"renewSessionToken","class":"OC\\Authentication\\Token\\Manager","type":"->","args":["*** sensitive parameters replaced ***","dpsm2nbqrltei7ublghgi7vd9noau6ti"]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php","line":1239,"function":"loginWithCookie","class":"OC\\User\\Session","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php","line":1125,"function":"handleLogin","class":"OC","type":"::","args":[{"__class__":"OC\\AppFramework\\Http\\Request"}]},{"file":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/index.php","line":25,"function":"handleRequest","class":"OC","type":"::","args":[]}],"File":"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php","Line":225,"message":"Renewing session token failed: ","user":"488-58petritz-officepetritzgmailcom","exception":"{\"class\":\"OC\\Authentication\\Exceptions\\ExpiredTokenException\",\"message\":\"\",\"code\":0,\"file\":\"/var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php:225\",\"trace\":\"#0 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php(177): OC\\Authentication\\Token\\PublicKeyTokenProvider->checkToken(Object(OC\\Authentication\\Token\\PublicKeyToken))\\n#1 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php(240): OC\\Authentication\\Token\\PublicKeyTokenProvider->getToken('nu49rgs2nd085vo...')\\n#2 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/public/AppFramework/Db/TTransactional.php(45): OC\\Authentication\\Token\\PublicKeyTokenProvider->OC\\Authentication\\Token\\{closure}()\\n#3 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/PublicKeyTokenProvider.php(239): OC\\Authentication\\Token\\PublicKeyTokenProvider->atomic(Object(Closure), Object(OC\\DB\\ConnectionAdapter))\\n#4 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/Authentication/Token/Manager.php(160): OC\\Authentication\\Token\\PublicKeyTokenProvider->renewSessionToken('nu49rgs2nd085vo...', 'dpsm2nbqrltei7u...')\\n#5 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/private/User/Session.php(912): OC\\Authentication\\Token\\Manager->renewSessionToken('nu49rgs2nd085vo...', 'dpsm2nbqrltei7u...')\\n#6 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php(1239): OC\\User\\Session->loginWithCookie('488-58petritz-o...', 'jewaivNQ8JsRNQ0...', 'nu49rgs2nd085vo...')\\n#7 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/lib/base.php(1125): OC::handleLogin(Object(OC\\AppFramework\\Http\\Request))\\n#8 /var/www/vhosts/amp.anexia-cloudstore.com/htdocs/index.php(25): OC::handleRequest()\\n#9 {main}\"}","CustomMessage":"Renewing session token failed: "}}
```

### Additional info

_No response_

Start by reproducing the Windows VFS behavior using the listed client and server versions, then inspect the supplied client and server logs around the failed PROPFIND requests. Done means identifying why folders such as Novigrad become unavailable after synchronization and ensuring all files remain visible and directories can be browsed without errors; no source files or tests are named.

Written by the indexing model from the issue text.