Armor Stands with Marker:1 tag fall through blocks.
This bug only affects 19w04a and newer snapshots.
I read the changelog and I think this is maybe due to the collision code "improve".
PS : why can't I choose 19w04a in the affected versions field ?
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-143069.
It has been linked to this report. If you have additional information, please add it to the duplicated report.
Please search before reporting, as it's likely that one exists already.
Because it's outdated.
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