WebDAV external storage breaks Markdown share links and favorites after reconnecting

⚠️ 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

The external storage set up via WebDAV, and then the newly created markdown share links or favorites often stop working.

I guess it should be WebDAV. Sometimes it doesn't connect, sometimes it does, which causes all the recent and other records to be missing. Even if it connects later, those are still lost. But actually, I’ve never changed the WebDAV account or password, so this is really frustrating. I hope this problem can be fixed, dad.

Steps to reproduce

1. In the user backend, add external storage, then add an md file in this directory and share the link.
2. You can try temporarily disconnecting WebDAV, then reconnect it afterward.
3. Then you'll find that the shared link doesn't work.

Expected behavior

I hope for WebDAV's stability, because a lot of content on external storage will be added to favorites or shared for collaborative editing. As long as the WebDAV source doesn't change, it shouldn't stop working.

Nextcloud Server version

34

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.4

Web server

Nginx

Database engine version

MariaDB

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

No response

No files, tests, or entry points are identified in the report. Start by reproducing the WebDAV disconnect and reconnect sequence, then trace the external-storage paths involved in Markdown share links and favorites. Done means those links and favorites continue to resolve after reconnection without losing records.