There appears to be a bug where, on login to a realm, BDS or singleplayer worlds, the player will fall through the block that was previously below them.
Steps to Reproduce:
Stand on a trap door when logging out
Log back in
Fall
Observed Results:
When logging out on top of a trapdoor you will be guaranteed to drop down when logging back in.
Expected Results:
You should log back in on top of the trapdoor.
Blocks Tested:
Trapdoors - Fall through
Slabs (upper or lower) - Fine
Carpet on top of torch - Fine
Notes:
This may be limited to trapdoors but I mention blocks in general as it also seems to have happened in SlackLizards recent video. There are also bug reports for falling through bedrock but those seem to be chunk loading issues so I didnt just add to those.
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Silent just mentioned it might be related to MCPE-13451

Can confirm for 1.14.1, and 1.14.2

Uploaded a video of the bug in action.

Same thing happen when on chests

Does this still happen with chests in the beta version?
Resolving issues that were marked as fixed in the 1.15 and 1.16 Betas, now that 1.16.0 is being released.

This issue was fixed for trapdoors indirectly by the fix to MCPE-13451. We are now tracking falling through chests and other blocks on relog at MCPE-84023.