I've noticed that WinUAE wait for blitter option doesn't work or fix things for me when blitter waits are missing in the game. Immediate blitter does the trick, always.
Best way to code is to wait for blitter just before modifying anything for the next blit.
Sometimes blitter waits have been inserted in a lazy way (I plead guilty) to wait right after BLTSIZE because it's easier, but it's also slower.
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