Blueprint still dirty after compile -no error

Hi dear Unreal staff, at first I checked two other bug reports here before I post this question, and I think mine is different.

Everything works verywell. There is no error. I also packaged the game and there is no problem. But blueprint always dirty.

I am not sure where it starts but I guess it starts after I put create widget function. But even I delete this it still same. I followed these steps;

  1. I created copy of my BP(duplicated)

  2. After I copied and re-open the clone, after I compile the clone, dirtiness gone. But if I re-open the clone BP still same.

  3. try to delete part of BP one by one, I started first “get input key down” and doesnt work

  4. I deleted “Input Action Jump” -Key a connection node(colored blue) and it works!

sorry I dont know how to mention but may be you may add my issue on here, bug report ue22761

Looks like they are similar.

Here is scrshot of blueprint