Crash 1.15-pre1 players can't connect

This is caused by too much server lag.

We do not have enough information to find the cause of this issue.

While the lag occurs, please run /debug start, wait a while and then run /debug stop in order to create a debug profile. Afterwards, run /debug report.

If you do not have the permission to run these commands, open your world to LAN and enable cheats. If you're on a server, make sure that you're a server operator in order to execute these commands.

Then, please attach the profile results found in debug/profile-results-<DATE>.txt, as well as the debug report found in debug/debug-report-<DATE>.zip here.

_{This issue has been temporarily closed as Awaiting Response. Once the requested information has been delivered, the report will be reopened automatically.}

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Ok

new Debug file with debug start :

Can you also attach the debug report, like violine mentioned?
"as well as the debug report found in debug/debug-report-<DATE>.zip here."

MC-138550 describes their issue somewhat

SOLVED in Minecraft 1.15-Pre-Release 2