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|If I may speculate some, I think that the issues with the doors in the X4 may be related to shared assets being changed around significantly.
That is, the game loads a series of sprite data for levels into certain areas of RAM and VRAM. Although the doors may be loaded in their proper place, X4 probably has a different master object list for levels. (such as the Rockman 7 and Rockman & Forte object viewer modes have suggested).
The X4 levels probably hadn't had their object lists updated, leading to the game reading data from locations that aren't graphics data, struggling to interpret it, and either acting wildly or crashing, or as has been described, using random sprites from other things haphazardly because the original object data has been shifted around.
I'm more curious about the X5 beta's subweapons, though. A while back, for an unrelated project, I was given someone else's extensive research into Zero, and it included animation rips from X5, including what I think may be a beta F-Splasher graphic. Seems to match the atrocious art style on some enemies from this beta. Though I'm personally hoping we find an animation viewer hidden away in this beta, probably tucked away in all that odd garbage data that's at the very start of the ROCK_X5.bin file.
EDIT: Fixed up what sounded stupid.