I'm having the same exact problem with the latest sonar platinum (Everett Update 1 - 21.4.0.30) and replika (v. 1.2.2.748), updated yesterday and verified no further updates just now. Add replika and instant sonar crash. Both vst and sonar are x64.
FWIW, the same version of replika works fine in Ableton Live, Studio One, and Bitwig. Sonar is the only DAW that is crashing. Sonar seems otherwise stable here.