[0.50][Bug] Levelling screen issues

When playing my henchmen game as before, I noticed if several of my units gained new levels at the same time, the levelling screen would start to display weirdness.

I experienced the following:

Often: Incorrect talents would be lit up, even if I did not already have these talents.

Rarely: I could skip earlier talents and go 1 step further up the tree, effectively skipping a talent.

Very rare: I was unable to pick a talent that I had not picked.

I assume the problem is inproper initialization of the screen, especially when several sovereigns and henchmen gain level at the same time (perhaps always?)

I will come back with screenshots when it happens again.