[concertmaster3]

I'll try to explain it...and the work around I've been using, since I thought it was working as intended.

Make a marking with either pencil, highlight or text.
While still active in that marking, click one of the other three.
The first marking will change to the default of the other.
This is most striking from pencil/text to highlight, or vice versa.

The work around is to use the arrow pointer between tools, and click somewhere where there aren't annotations.

This is similar to creating separate, consecutive drawings with highlighter or freeform.

Hope this helps clarify.