why can't they, I know they can jump. They are just lazy
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Mobs can't see block states. For example, they can't tell the difference between top and bottom slabs, and they can't tell the difference between various trapdoor configurations.
In the case of trapdoors, they assume they can walk on trapdoors below them, but they also assume they can walk through trapdoors at the same height as their hitboxes. Here, they assume they can walk through the trapdoors and try to walk out of the box because they don't realize they need to jump to get out.
Fixing this behavior would make all mob pathfinding more complex and would likely degrade game performance.

then it's unfixable

Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-50556, which is a report that has not been resolved yet.
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