dunno if this was reported yet, but i found another issue that can crash people's games if they use pyrovision. if using pyrovision, using the burning red unusual effects (donator plugin power) on a melee weapon (might work with other weapon slots) and repeatedly changing weapons back and forth causes the effect to stack over and over. if done enough, the user's game will crash. but if done right, it can reduce their fps to the single digits. Other people in pyrovision can see this as well and will suffer the same effects just by being around someone who has done this. So abusers can use this on other players and either crash their games or lag them to hell. Actually it could cause guaranteed crashes. the effect is there but only affects you if you use pyrovision, so the user can do the method without using pyrovision. That way they wont lag but can insta-crash anyone with pyrovision.
UPDATE: with some testing from cooperative people, other players have reported seeing this even without pyrovision equipped. So this could be even worse than suspected. The effects are removed by either dying or using shred alert. Also, on an unrelated note, the entire unusual plugin doesnt work if the prinny knife is equipped. it causes a constant weapon switch and fighting is impossible.