I just started having the same problem - no latency with my keyboard controlling TruePianos before Version 2020.08 (Build 100, 64 bit). Now I get upwards of 1 sec latency if there's a plugin in the Master Bus (I have LP MB there), and no noticable latency if I turn the plugin off. I can press a key on my keyboard with normal pressure and easily raise my hand 8 inches off before the note sounds.
Here are my audio settings - both before and after the 2020.08 update.
Please believe that I changed no settings since the 2020.08 update. While the workaround is straightforward - disable the plugin while recording - the situation is unacceptable.