Mattermost freezes after errors in Mattermost Boards

[KakEgorka]

When connect plugin focalboard to our Mattermost we face many entries in logs with errors:

{"timestamp":"2022-10-26 12:00:30.513 +05:00","level":"error","msg":"Plugin failed to ServeHTTP, muxBroker couldn't Accept request body connection","caller":"plugin/client_rpc.go:398","plugin_id":"focalboard","error":"timeout waiting for accept"}

{"timestamp":"2022-10-26 12:00:30.589 +05:00","level":"error","msg":"Plugin failed to ServeHTTP, RPC call failed","caller":"plugin/client_rpc.go:424","plugin_id":"focalboard","error":"EOF"}

after that Mattermost server freezes for some time and stop working. Over time server "alives" and back to work normally until another same errors triggers for some reasons.

Edition and Platform

• Edition: Mattermost Boards (plugin) (Mattermost Server Team 7.2)
• Version: focalboard - 7.4.3