That mostly fixed the right side blanking, however there are still a few (2 or 3?) pixels missing.
The display reappearing distorted after blanking problem is still there. My guess is, WinUAE detects a programmed mode change part-way through Debian writing the registers, so it picks up invalid/bogus settings. And for some reason WinUAE doesn't update the display when the last programmed-mode register is written. And manually changing line mode causes WinUAE to re-evaluate the programmed mode registers which fixes the display.
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