Encrypted folder automatically unsynced after upgrade

### ⚠️ 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 using Hetzner storage share, currently on server version 30.0.12
Client side is up do date. Maybe the problem is related to I upgraded the client before the server was upgraded.
I do not know which version I upgraded from, but I think it might be previous version.

When I am notified about a new upgrade I accept and install the update. Next morning when I am about to start working I realize files are missing on my computer and I see that the folder has been unsynced and is no longer cheked for syncing in the settings. Since the folder is encrypted it takes very long time to get it downloaded again.

Instead of using my most productive morning hours on working I use it for writing this report, still waitning for the sync to complete. I am also a bit worried data could be lost if this happens sporadically in the middle of editing something (however, I have no confirmation of that)

...

### Steps to reproduce

I have not tried to reproduce but it has happened several times after client upgrade.

### Expected behavior

Upgrades should not impact my selection of which folders that are synced.
...

### Which files are affected by this bug

Not sure what I should put here?

### Operating system

macOS

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

macOS 15.3.2 (24D81)

### Nextcloud Server version

30.0.12

### Nextcloud Desktop Client version

Nextcloud Desktop Client Version 3.17.1 (macOS)

### 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 Enabled

_No response_