Same on ECS Agnus here with ross' versions.
I have started to build a minimal example to reproduce this and tried to rule out other factors one-by-one: the copperlist was unbuffered, waiting until mid-screen before the blit queue, double-checking interrupt handler, check if I introduced a bug into the framework etc. -- so far with no success.
Since I have brought back some other fails-on-hardware bugs to fix from Revision (probably unrelated, though), it might take some time until I can get back to this.
Thanks for all your efforts on pinning this down so far!
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