Yeah, there were some changes “recently” that bound this function to the [t] key.
You can rebind it to tab if you wish… Open your inventory, press the [?] key (yes, actually a question mark) and remap the Switch category selection mode locally to [TAB].
I remember there was a collision with something else that also uses the tab key when I rebound it a few weeks ago, but I don’t quite remember in which case it happened and I don’t seem to find it now.