Record Track Changes works reluctantly on Experimental Contextual Groups Interface. There is no clue (highlight) to know if it is working or not.
Steps to Reproduce:
1. Enable Experimental Features and restart LibreOffice.
2. Choose View - User Interface - Contextual Group
3. Write something then click the Record icon from the interface.
4. Keep on writing then click again the Record icon.
Firstly, the icon doesn't indicate if it is active or not. In addition, if the recording option is active, sometimes the icon doesn't make it passive.
There must be a clue either the icon is active or not.
User Profile Reset: Yes
It happens only on Contextual Groups menu. Recording icons work very well on other interfaces.
UX of the NB variants are hardly to track in general, maybe this particular variant is not meant for track changes (which is not the fact). So up to the designer to decide what to do.
Another note: the contextual groups are meant for beginners who need less functions and more guidance. The NB should be as static as possible and has only a few contextual options. All other properties are set via sidebar and toolbars. So when you do TC it's supposed to be done by those means. See also https://wiki.documentfoundation.org/Design/ToolBar
But the issue with toggled Record button is true. And the sidebar should be open and the TC toolbar have to pop up.