Since Big Sur 11.2 and TF 1.13.8 the tabs are behaving strange.
When combining two taps only one shown (not the combinend tab shown) or one big tab with the two names of the folders in only one side of the big tab or when terminating one of the combined tabs, you’ll end up with 3 tabs… etc.
PLUS the old unfixed one:
When opening a .dmg file AND open a second tab in Total Finder to copy to,
NOW when doing a double click on one of this TAB’s to combine the TAB’s, Total Finder crashes and restarts, what takes 3-6 seconds.
When it opens up again he still got both tabs open but they are still not combined TAB’s.