Generally, it’s not really a good idea to use PC events with plugins. Apart from the fact that, only some plugins have support for it, you also don’t know how long it will take for a plugin to change its patch after receives a PC event. Depending on the plugin’s implementation, you may even get stuck notes if you were holding keys or the sustain pedal down when a program change is sent. It’s rarely instantaneous and you can’t take advantage of features such as Gig Performer’s Patch Persist™ mechanism that allows an “old” sound to continue even after you switch to a different set of plugins, using the standard rackspace mechanism. A plugin taking significant time (and 100th of a second is significant time!) to switch from one preset to another might also not handle updated widget values that get sent when you switch variations.

If you still want to use PC events with plugins, please refer to this article: https://gigperformer.com/use-host-automation-rather-than-midi-to-control-plugin-parameters/