Moving an issue is not a trivial action - the project and issue type are fundamental structural attributes of an issue and hence require a load of checks and usually updates in order to change the shape of the issue from the old to the new.
I would want to question why you are moving issues between projects. It can be a perfectly valid thing to do (mostly when housekeeping or correcting things raised in the wrong place), but if you are trying to do it as part of a standard process flow, then you have a broken process, and you should look to revise that so that you don't move issues.
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