Quill Mentions don't work when using "Quill - allowed formats for mini editor"

Mentions work fine if the "Quill - allowed formats for mini editor" field in the developer tools is left empty.

However, when various tags are specified, such as: ['link','a','bold','italic','underline'] - then mentions stop working. You are still able to type @ and it shows a list of users, but when you select someone, it just creates empty space ("br" tags).

I have tried adding "mention" and "mentions", however that doesn't help. How to add mentions to the format list?