categories of taxonomies don't persist

Summary

after adding a category to an asset, the assignation was lost

Content

Hi,

I've added to an asset the example category "UNO". As you can see in the picture, message on screen says "Successfully assigned category to asset(s)".

Now if I close this section and reopen it, no categories were assigned to the asset (previous add was lost).

Why this happen? I forgot something or is a bug?

No other operation are mentioned here: https://docs.oracle.com/en/cloud/paas/content-cloud/creating-experiences/assign-asset-categories.html

Thanks in advance,

Nicola