Ambient occlusion doesn't affect End portal frames (both normal and filled) despite their model files being changed to include the line "ambientocclusion": true,
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This is related to MC-165503
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This is likely due to them emitting a light level of 1. This is mentioned in MC-50734; I've proposed that end portal frame exclusive information all be moved to this ticket for reasons explained within a comment there and that ticket changed to instead cover more significant light emitters.
MC-6528 could also be forward-resolved into this report as a duplicate.

Actually, I've thought about it and it might make more sense to just resolve this as a duplicate of MC-50734. The fact that end portals emit light is best considered a separate issue.
Since end portal frames technically are a light source, resolving as a duplicate of MC-50734.