I'm not sure it is important but this takes place on Y level 1
Here is a video of it in action https://youtu.be/ZacX6tQe33U
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Thank you for your report!
We're actually already tracking this issue in MC-148869, so I've resolved and linked this ticket as a duplicate.
That ticket has already been resolved as Fixed. The fix will arrive in the next version or is already included in the latest development version of the game, you can check the Fix Version/s field in that ticket to learn more.
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This issue was fixed in one of the snapshots, it doesn't happen in 20w17a.