Markdown files (opened from webdav) are shown as codeblock

[gbraad]

I use webdav to connect to remote folders, like using Tailscale drive shares. When opening a project folder containing a README.md, the preview shows a grey codeblock, and when opened this is confirmed. When clicking the codeblock toggle, the whole file disappears.

Steps to reproduce

1. Mount remote webdav: Mount taildrive shares gbraad-homelab/personal-nextcloud#5
2. Locate the folder containing a project README: https://github.com/gbraad-gaming/private-cardforge/blob/main/README.md
3. Open editor, see attachment

Expected behaviour

Folder preview should render the file correctly, and editor should interpret the file correctly.

Actual behaviour

The whole file is seen as a codeblock. The codeblock toggle will remove all content and no Undo is possible.

Screenshots

Server

Please complete the following information.

• Notes app version: 4.11.0
• Nextcloud version: 3.0.4
• OS: Fedora 41
• Web server: apache
• PHP version: 8.3.14
• Database: sqlite

Nextcloud configuration:

``` If you have access to your command line run e.g.: sudo -u www-data php occ config:list system from within your Nextcloud installation folder ```

Client

Please complete the following information.

• Browser (incl. version): Vivaldi
• OS: Android

Log files

Add relevant parts of your nextcloud.log and/or your browser's JavaScript console here.

[gbraad]

Just tried it from another workstation; Fedora 41 with Vivaldi, and notice that this happes during the preview. It immediately modifies the file.

Here I did a git reset --hard and see that Nextcloud chnaged the file and complains about the modification (being restored).

This I have not seen on a local Project folder that is viewed in Nextcloud's interface.

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Just browsed to another project folder and can see it happen. It first renders correctly, and then modifies the file on the fly with a code block. The file is NOT modified on disk, but swaps from a correct rendering to a full codeblock. I'll try to record this tomorrow, as I will try to see if the browser on Windows also does this. If the file is then opened with the editor, it gets modified on disk.

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Recording.2024-12-17.015340.mp4

Recording.2024-12-17.015724.mp4