Rich Text Editor bug with commands

I am using safari so I can't make a recording with Jam Chrome extension. But I made normal screenrecording.

Describe your question/issue in detail

The rich text editor has a bug that it (sometimes) doesn't allow me to set Heading-levels and/or add links.

Impacted feature

Rich Text Editor

What steps have you taken to resolve this issue already?

Sign out and sign in, restart webbrowser

Errors

No errors are thrown in the browser. The functionality of the headings and links just doesn't work sometimes.

Your Role

Content editor

Steps to reproduce

Open a slice that has a Rich Text Editor as field and try to set a couple headings and/or links.

@ro.vdv Could you please share the model.json file for the slice you're working with?