Assignable Controls created for a synth in the Synth Rack should be recalled every time the synth is inserted again. This is true when inserted again from the Synth Rack, but when inserting the synth either from the Add Track button in the top left corner of the Track View, or a Track Template with that synth and the Assignable Controls already created, no controls show.
I also find annoying that Remote Control setup for the Assignable Controls created is lost even when they are recalled properly, but I believe that this has been so for ages, i.e. this is a non feature rather than a bug. It would be great that Remote Control data could be saved with Track Templates.
I found out this when trying to find a way to control the macro knobs of the new NI Massive X from my master keyboard. It is already clunky from Native Instruments side, since actual midi learn for the synth has not been implemented yet, but also having to assign them to the 16 knobs in my master keyboard every time I insert the synth is a real pain. I tried with Z3TA+2, too, just to be sure, same results.