[Bug]: Server fails on files modified in 1970-01-01

[quazgar]

⚠️ This issue respects the following points: ⚠️

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

Bug description

I just ran into nextcloud/desktop#4332 (closed as stale), but on Debian Linux (Version 3.7.3). To me it looks like a server error, at least that's what the client reports.

Files and directories with mtime on 1970-01-01:

$ LC_ALL=C stat misc
  File: misc
  Size: 160             Blocks: 0          IO Block: 4096   directory
Device: 0,41    Inode: 38735767    Links: 1
Access: (0755/drwxr-xr-x)  Uid: ( 1000/  quazgar)   Gid: ( 1000/  quazgar)
Access: 2024-12-03 14:14:48.272056555 +0100
Modify: 1970-01-01 00:00:00.000000000 +0100
Change: 2024-12-03 14:14:48.268056818 +0100
 Birth: 2024-12-03 14:14:17.278073007 +0100

I get this error in the client:

Error transferring https://cloud...../misc - server replied: Not found

Steps to reproduce

1. Create directory with mtime = 1970-01-01T00:00:00
2. Try to sync with server.

Expected behavior

1. It should sync.

Nextcloud Server version

29

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

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

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

I do not know details about the server, it is the one hosted by large German provider Hetzner: https://www.hetzner.com/storage/storage-share