Simply put, my FDPs are not being assigned categories despite my efforts - see screen cap video attached.
1. Create Category
2. Select Product
3. Assign category.
The category has a spinner indicating that somethign is processing, but refreshing the page and clicking 'Only show products from this category' shows an empty category.
Seems to be an issue only you are experiencing. Please open a support ticket we'll need to access your wp-admin.