Flip Flop reverse doesn't work - double door

Thanks very much for the explanation.

I’ll see the videos and do some testing and then I’ll let you know. The collision box is there, on every BP but I think another part of the script is missing due to my inexperience.

I’d prefer the line traces method. I think that the two links refer to the same video but no problem, I’ll document myself.
Now I know what to work on, thanks to you.