Edit issue does not work

Summary

Editing an issue does not work in special cases. I had an Code Snippet in my Issue and wanted to mark it as Code and tried to save it but nothing happens. It seems that just mark something as Code or make something bold does not trigger a save. If beside the markup changes another letter is added or removed everything works just fine. The preview of the markup changes seems correct but after a click on save it's all gone.

This does not apply for comments.

Steps to reproduce

Edit an Issue Mark a word or a sentence and highlight it (Optional: Click on Preview) Save the edited Issue

What is the current bug behavior?

Nothing is saved.

What is the expected correct behavior?

I expect the changes to be persistent.

Output of checks

This bug happens on GitLab.com