[Blue Burst] Monster Desyncs after joining in-progress 1-3 party as 4th

[nolrinale]

Describe the bug
A player of 3 started quest 1-3 and got to almost the end, then I joined as the 4th player right at the end, they opened a red tele and i went down, 2 monests appeared but I was still killing them while for all of them they had already died (see screens below)

To reproduce
Fill in steps to reproduce the behavior, such as:

1. Start 1-3 with 3 players
2. Wait for them to get to the end, then join as a 4th
3. Monsters will exist on your screen while for them they were already dead.

Game version(s) (choose one or more of the following):
BB

Server log output

1-3MonDesync.zip

Additional context
POV Player 1

POV Player 4