Since the release of 1.14 Experimental, it is impossible to join or play on my community server.

The login procedure is VERY SLOW, starting from the moment I click PLAY, everything suddenly is taking between 10-20 seconds, as if there's a serious connection problem.
It takes the client at least 30 seconds to initiate the communication with the server, which is highly irregular.

After clicking PLAY and waiting for a long time - the 15 sec countdown starts, and when it's done counting, the client gets stuck as it's waiting for a response from the server.
The counter window remains on the screen for 2-3 minutes (without a countdown, blank).

After a long while, the client is able to log in - BUT - the game is unplayable - It is almost impossible to interact with with anything, sometimes the character falls down from the earth to oblivion.
Eventually, the server crashes.

Deleting the world and starting a new one - solves the problem.
In fact, I was able to play without any problem for at least an hour on a fresh world.

Deleting the characters only - Did not help.

This is a Vanilla server running with 2 server-sided mods (Weather Control and SMM) - disabling them did not change anything.
Clearly, there is a problem with the saved world, although I can't see anything in the logs that wasn't there before.

Note: This world more than 2 years old and never got wiped, I prefer to identify the problem and solve it and ofcourse to avoid a wipe.