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For what its worth, I'll share my experiences here:
I had nearly the same problem, I dont remember QUITE fully how that phenomena worked out in my...
you can also delete the actual tile files.(those that get created when you import a picture to a palette.)
the ending is '*.asset' AFAIK
I am not really what you could call an expert.
But my idea(s) on your problem(s) is/are:
Just put your logging at the end of your constructor....