I am getting 500 internal server error while adding menus after some entries. The comes when i add new item and click on the update menu button. I have already try to debug a few things:
Turning off all plugins one by one.
Turning On all plugins one by one.
When there is no plugin activated then it save the menus fine. But when i activate any of a single plugin it start throwing the error. Also when i activate 2020 theme it also work well.
You can check the issue adding menu items to a menu called “Full Menu”. Hope you can fix this problem. Thanks