It’s normal because it’s php doing that. We don’t set the header for phpsessionid. We can’t. It’s happening multiple times because we are starting and stopping the php session to add and removing items from it (but not 41 times). Which is normal (normal because Php adds the sessions 41 times)
Not to be the “a hole” here but if you believe this is a violation of RFC6265 then you need to go report it to php.