[Ohrrpgce] Palette loss when switching palettes in the sprite editor

[James Paige]

Taoki reports that sometimes palettes are overwritten in the sprite set
browser when you press [ and ] to switch them.

I was able to reproduce this in Wandering Hamster just by going into the
hero sprite browser, and changing Bob's palette from 0 to 6 and then back
to 5 again.

I don't understand the pattern yet, but it does seem deterministic.

(gif demonstration attached, the gif feature is a godsent!)
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