There is a critical performance issue!
“Unyson” plugin interferes with REST API and loopback requests.
[ A PHP session was created by a session_start() function call. This interferes with REST API and loopback requests. The session should be closed by session_write_close() before making any HTTP requests. ]
Thank you for your question.
To resolve the session_start error please try using the solution shared in the following topic.