Hello Mark,

Yes, you just hit an 'AI is not always right' moment.There is no mix of menu items between J2Commerce 4 and 6.

However, the behavior on sub-categories is incorrect in J2Commerce 6, you should not get a 404 when selecting sub-categories of a category.

A workwaround, for now, is to create a 'Product Categories' menu item, even if you don't show it in your menu. It will ensure there is an associated menu item for the categories. 

Mark,

If you can update your website information on the ticket I can take a look at it. Most likely, you are using a category menu item when it should be a categories menu item - one categories menu item is all you need to manage multiple categories and their children categories - works the same way with the core Joomla 6 categories menu item. Switching to a single category list view only creates urls for that category, if you have sub categories below them, you would either need to change the parent to the categories menu item or create category menu items for each of the children...

Adam

We addressed this issue in the upcoming bug fix release of the extension so you don't have to think of it again :-)