I believe the spring arms collision isn’t on the camera that’s parented to it, but on the spring itself. So, if the camera that’s child to the spring arm has an offset, it will push through assets. If you need it to have an offset for whatever reason, then it should be within the distance you have set for the springs ‘probe size’. For example, if your probe size is 50 (not sure if this is radius, or diameter. Keep that in mind), then you can offset your camera in any direction by that amount. So if you want it to be higher, but not collide through assets above you, this is how you can achieve that. It’s good to keep a slight buffer though.
I’m not sure if this helps, or fixes anyones issues, but I stumbled across this post and noticed some people are still having issues, so thought I’d put my 2 bits in.