You are correct, the mistake is on my side- I didn't know this addon is still being updated... So I switched to the GitHub version and everything is fine now!
By the way, what's the difference between the pickup and a SWEP? Or even an entity, as an ammo box for example? And thanks for fixing the bouncy ball, I can now restrict it as an entity. Now I only need to find a way how to restrict the directional gravity arrow and SCars