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I took your advice, emptied my dock of icons, and replaced them one by one. Afterwards, things worked fine again.
I now have to send my MacBook Pro back for repair again (they broke some things while fixing others), so I've backed up to my external drive and then restored from the external drive to a loaner laptop.
After rebooting from the external drive, all my dock icons were fine, and they stayed fine after restoring to the loaner and rebooting from the loaner's drive.
So whatever the problem was, it appears to be resolved. Perhaps rebuilding LaunchServices fixed the problem, except for icons that were already on the dock.
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