Remember this moment - (shop.convert.from.1.2.26 — command to convert Shop plugin version 1.2.26 to version 1.3.0+) ?
When I upgraded to version 1.2.26 I had
{
"Enabled": true,
"Category Type": "None",
"Title": "Medical",
"Permission": "",
"Sort Type": "Name",
"Items": [
and the old categories that moved to the new version remained, but there was no add button.
And now pay attention to the category setting in the new default format:
{
"Enabled": true,
"Category Type": "None",
"Title": "Medical",
"Permission": "",
"Sort Type": "None",
"Items": [
You can see the difference, there is an add button with these.