Is the server-side push in Pylsp thread unsafe？

[WutingjiaX]

I have developed some business logic based on Pylsp (without modifying the logic related to WS). One of my business characteristics is that a didopen/didchange request may trigger a large number of server notifications.
But I found that there is a probability that it will cause the client to throw a 1002 error code, leading to the closure of the link.

If I make the interval of each notification longer（like sleep 0.1s） , this problem would not have occurred.

Under circumstances where there is a large number of pushes, by printing the thread number, I have indeed found that after a certain threshold（maybe 20？）, it will switch from single-threaded to multi-threaded pushing.