I upgraded from Magento 2.5.0 to 2.3.1
I am using only PayPal as a payement method.
new orders are not showing in the orders grid in Admin > Sales > Orders and emails are not sent !!
when I check PayPal summary I can find the invoice number so it is created in Magento but not showing in the grid
I already tried to change
Store > Configuration > Advance > Developer > Grid Settings
Enable / Disable, flush cache, reindex, but not working
When I check sales_invoice and sales_order tables there is no recent invoice !!but in PayPal summary I have the invoice number and items !!
Any fix please.