There is a thread about it right under yours.
https://psteamcommunity.yuanyoumao.com/discussions/forum/1/597412823492378669/

In short Valve broke something...

This is a known bug in Steam, which prevents curators from saving reviews or adding games from the recently played list. The issue is likely with the Steam client, and many users have reported it. As a temporary solution, you can try executing the command steam://flushconfig to reset the client settings, or attempt to publish the review via the web version of Steam. The most reliable way is to wait for Valve to release a fix.

oh thanks both of you