If I jumped ,and right clicked on the bed at the same time,I could sleep on the bed.Then I was kicked out the server.It said that the server has not open the fly.I found this bug from 1.13,and this bug is still exist in 1.14.
MC-153928
A bug in Minecraft Server
Resolved
Duplicate
0
Nikke Simon
(Unassigned)
Unconfirmed
Minecraft 1.14.2
Retrieved
Duplicate of MC-114544