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I don't think this bug exists in any production Agnus version, not even A1000 Agnus.
Copper does fetch next word after last $ffff,$fffe before internal COP1LC copy but this is harmless. Perhaps it wasn't that harmless in early Agnus versions?
Another possibility is that early pre-production Agnus versions didn't have copper blitter wait bit (can be seen in leaked Agnus schematics) and perhaps this update also fixed the bug?
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