Anchor links do not bring you to the relevent heading

[mstenta]

Describe the bug

In the text editor, when you hover over a heading (H1, H2, H3, etc), it offers a little hashtag icon to the left of it with a link to that anchor point in the document. For example (the #h-2026-06-09 bit in the URL below):

https://mycloud.example.com/apps/files/files/162509?dir=/todo/2026&editing=false&openfile=true#h-2026-06-09

However, opening this link does not take you to that heading. It appears that the anchor is dropped from the URL during the process of loading the document.

To Reproduce
Steps to reproduce the behavior:

1. Create a text file (markdown) with a heading.
2. Copy the link to the heading with the appropriate hashtag appended to the URL.
3. Visit that link in another browser tab.
4. Observe that you are not taken to the heading, and the hashtag is dropped from the URL.

Expected behavior

I would expect that visiting that link would take me to the appropriate position in the document.

Server details:

• Nextcloud version: 32
• PHP Version: (using official Docker image)
• Database: PostgreSQL 14

Client details:

• OS: Debian
• Browser: Firefox
• Browser version: 128.4.0esr (64-bit)
• Device: desktop

[mstenta]

For what it's worth, in Firefox Debugger, with an Event Listener Breakpoint set on "Load > hashchange", execution pauses on this line of the VueUse library: https://github.com/vueuse/vueuse/blob/fbdd28679ce56c2ff2d41e44353775f15e1bfef1/packages/core/useBrowserLocation/index.ts#L82

That breakpoint hits twice, and the hash is gone from the URL on the first one.

I'm a bit out of my depth debugging this, but perhaps that is helpful information...