Structured text block duplication

A colleague reported an issue that I have been able to replicate consistently.

When copying the content between locales and modifying a structured text field that has some buttons inside of it, the buttons are getting misplaced and duplicated.

Seems like the only thing we can do at the moment is rebuild the entire content by hand which is making our team work slower than we would like.

Any idea as to what could be causing this issue?
Bug reproduction

Hey @lluis ,

I replied to you over email, as i couldn’t reproduce it on our end, let us know through there if i missed any steps or if there is a specific place where that is happening