All text deleted after a newly added tag

Nobody has claimed this yet.

### Search first

- [x] I searched and no similar issues were found

### What Happened?

I added a new tag in a sentence and all text after it was deleted.

### Reproduce the Bug

0. i'm on a page
1. i select the text of an "unlinked reference" to edit it (maybe also happens with linked referenced or journal/page block)
2. i select one word (in this case, the word that is the reason for it to be an unlinked reference. alias of page title. might not be relevant)
3. i delete the word
4. i add paranthese: `[[]]`
5. I write tag word in them
6. i hit enter, to select the tag
7. sometimes: the text after the tag get's deleted! (**DATA LOSS!**)

Not always reproducible. Had it once now and was able to reproduce it in the linked video.

### Expected Behavior

No data loss when using a software. Don't remove random data i haven't touched.

### Screenshots

Video: https://youtu.be/A2x4kc3rh-g?si=UaO2CVozJG-BP7mj&t=182

### Desktop or Mobile Platform Information

Desktop App 0.10.12 (from nixpkgs stable)
running on NixOS 25.05.807027.3ff0e34b1383

### Additional Context

The Video show also some UX issues, but i don't have energy to report them all. So here is just the issue that lead to data loss.

### Are you willing to submit a PR? If you know how to fix the bug.

- [ ] I'm willing to submit a PR (Thank you!)

Start by reproducing the reported sequence in the desktop app: edit an unlinked reference, add a tag with `[[]]`, and press Enter, checking whether following text disappears. The issue names no source files or tests; done means the tag can be selected without deleting untouched text and the intermittent data-loss case is covered by a regression check.

Written by the indexing model from the issue text.