Hello. I tried it with a clean project, it doesn’t happen there. Maybe something wrong with the specific project. For now I can switch to another Event Graph and I can compile it just fine. This appears only on the “Item Events” Graph which you can see in the video. My DxDiag: dxdiag
As this is not occurring in a clean project, and seems to be resolved if you use another Event Graph, I am going to mark this topic as resolved for tracking purposes. I have been unable to reproduce the issue on my end either. If you do come across a consistent repro case for this issue, please feel free to share and reopen this thread so that we can continue investigating.