Failed to execute 'getReader' on 'ReadableStream': ReadableStreamDefaultReader constructor can only accept readable streams that are not yet locked

I ran into this error today:

Failed to execute 'getReader' on 'ReadableStream': ReadableStreamDefaultReader constructor can only accept readable streams that are not yet locked 

I’ve tried to disable IPv6 and other browsers but none of them worked.
Does anyone figure out how to solve this issue?

update(2024/03/13):
Even when I get help through the chat it got WebSocket errors in the console:

update(2024/03/25):
I resolved this issue by set correct proxy protocol: