Noticed this was taken into consideration in v2.88. Thanks for remembering, Florian 
Just some thoughts on in the way it's implemented currently: it appears the fields don't flow to fill the columns depending on the height of the Tag Panel. So while they will now expand into more than 3 columns (which is great) there seems to be a fixed maximum number of fields/height for each column.
Screenshot:
In the test above producing a horizontal scrollbar due to fields not reflowing into existing empty spaces of columns first.
Just thought I'd bring this up since I certainly appreciated seeing it mentioned in the changelog 