Modular Powersuits is part of the FTB Ultimate Anniversary pack, and is listed as using "ModularPowersuits-1.16.5-2.1.17.jar" for reference.

When wearing a full suit of power armor, and accessing the tinker table, no modules show up in any of the tabs (besides the two vanilla head pieces). Screenshots:

That's an outdated version that was already fixed weeks ago when that GUI was overhauled. Aside from that GUI being trash, only unlocked recipes would show.