Hey @MrGoatsy!
I don’t really know if it’s something that is “fixable.”
As far as your .gif goes, what is making it dirty is changing which window is open in the Blueprint. It’s functionally the same as moving a node up by 1px, it’s now different. When you save a blueprint it keeps up with all open windows, and which window is in front, etc. so when you reopen it you see the exact same layout as when you left off. I wasn’t able to find anything on how to stop this from happening, but when I’m using Version Control and open something just to look at it, I’ll revert it instead of saving the changes.
Hope this helps, maybe someone else will have more insight!