ERROR Found ] after updating item specifics it doesn't save or deletes some categories. only to leave you needing to update the item again and again
I think i found the solution.
Glitch: if you have outdated item specifics selected such as : item period made "1999-now" chosen this needs to changed to "2020-now" or whatever new item specific option is newly available
this will prevent the constant error of eBay mysteriaously your hard work of updating item specifics in other section of the listing.