[Bug]: Can't sync some files with the desktop client (Linux/Archlinux); v 3.15.3

[lars-becker]

⚠️ Before submitting, please verify the following: ⚠️

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

Today I discovered that some files weren't synchronized. I can't say for sure if this problem was introduced with the latest client, version 3.15.3, or before. I tried various measure to solve this problem, but all of them failed. I then deleted the sync journal and tried again. The problem persists

Steps to reproduce

I the problem reoccurs on the production system, but I can't reproduce it on a test installation.

The log file says:

2025-03-06 17:35:08:052 [ info nextcloud.sync.discovery /usr/src/debug/nextcloud-client/nextcloud-client/src/libsync/discovery.cpp:553 ]:	"Processing \"B*.pdf\" | (db/local/remote) | valid: false/true/false | mtime: 0/1741276452/0 | size: 0/3090179/0 | etag: \"\"//\"\" | checksum: \"\"//\"\" | perm: \"\"//\"\" | fileid: \"\"//\"\" | type: CSyncEnums::ItemTypeSkip/CSyncEnums::ItemTypeFile/CSyncEnums::ItemTypeFile | e2ee: false/false | e2eeMangledName: \"\"/\"\" | file lock: not locked// | file lock type: \"\"//\"\" | live photo: false//false | metadata missing: /false/"
2025-03-06 17:35:08:052 [ debug nextcloud.sync.discovery /usr/src/debug/nextcloud-client/nextcloud-client/src/libsync/discovery.cpp:1046 ]	[ OCC::ProcessDirectoryJob::processFileAnalyzeLocalInfo ]:	File "B*.pdf" - servermodified: false noServerEntry: true
2025-03-06 17:35:08:052 [ info nextcloud.sync.discovery /usr/src/debug/nextcloud-client/nextcloud-client/src/libsync/discovery.cpp:1347 ]:	Not a move, no item in db with inode 3719329
2025-03-06 17:35:08:052 [ info nextcloud.sync.discovery /usr/src/debug/nextcloud-client/nextcloud-client/src/libsync/discovery.cpp:1700 ]:	discovered "B*.pdf" CSyncEnums::CSYNC_INSTRUCTION_NEW OCC::SyncFileItem::Up CSyncEnums::ItemTypeFile

I redacted the file name because it included the name of applicants.

Expected behavior

The files that weren't syncronized should be syncronized.

Which files are affected by this bug

B*.pdf

Operating system

Linux

Which version of the operating system you are running.

Arch Linux

Package

Distro package manager

Nextcloud Server version

Nextcloud Hub 9 (30.0.6)

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?

• Default internal user-backend
• LDAP/ Active Directory
• SSO - SAML
• Other

Nextcloud Server logs

Can't access them. The server is not managed by me.

Additional info

No response