This is a known bug at the moment, I'm afraid, but I have a promising fix in the works. Someone on the Discord reported that the thing I'm trying to add in worked for them already in a more improvised format, but I probably won't have the proper full, flexible fix ready to go until the weekend, assuming it continued to work as expected.
Hey chief, thanks for taking a look at it, and don't worry about it too much; I had trouble getting SPT working with all these updates from EFT and SPT itself and had to reinstall everything along with the plugin and mods (PAIN). However, I can confirm the BEAR PMCs fought me and engaged when I was playing testing it on Factory as a Scav; thanks for looking into it! Although, when I was trying it out, some things I noticed were the guards spawned in despite their bosses not being there and raiders being classified as Scavs when I murdered them along with (and I don't know if this is a problem or an actual feature) but the Raiders don't engage Scavs. Is there perhaps a way I can edit these three changes in the config file, or is it a bug on your end? Reply when you can, and any help would be appreciated!