Sometimes Undo is "Undo Save History State for Image"...

Anyone know why the Undo command occasionally produces "Undo Save History State for Image" rather than a proper undo of the last operation?

I am aware of your contribution to this forum and genuinely have utmost respect for what you say, however without getting too heavily into the semantics of the meaning of the word “bug” I would truly appreciate your thought on this …
b_gossweiler wrote:
If you export (or also print) an image, an entry is inserted into the develop history of the image. Although these steps (export, print, ...) cannot be physically undone, the undo removes this history step from the develop history of the image. This makes sense and - IMHO - is not a bug at all.
Beat
Would it not be reasonable that when a user requests an “undo” that they would expect this to undo the last thing “they” did regardless of what any background task is doing?   
If this does occur when performing some background task on several hundred or thousand images does this mean that they could struggle to actually achieve any meaningful undo operation on what they are currently working on because they could be attempting to undo many state changes?      If so, could one consider that from a user’s perspective the undo mechanism is actually broken in this scenario?
If they request an “undo” and it does not perform to the users reasonably expected behaviour would it not reasonably be considered at least undesirable if not a bug?
If they perform an “undo” and they get this message have they actually undone something which might be important?   
Even if it has no ill effects the message alone could be unsettling and confusing to users?
You say it makes sense and I know I’m slow, but I would not expect a user to see this message when the user wants to undo for example the modification to exposure or other slider they have just changed.
I’m not hung up on this as I have seen no ill effects other than mild inconvenience; however I would respectively appreciate your views on how this “makes sense” from a user’s perspective.

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