Honestly, I recently picked up a 2014 Fender P5 that had the exact same thing happen to. Last week I picked up a fret end dressing file from Stew Mac. Never having done this before, I took my time and within an hour the bass was done and smooth like there was never an issue. Invalid Link Removed
I clicked on your stewmac link and saw this: Fixing fret ends that stick out in dry weather
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You used just the fret dressing file, but I could see how the 3-corner would help for ends that stick way out.