Google ended Widevine support for 32-bit Linux on May 31, 2021:
https://news.itsfoss.com/netflix-issue-32-bit-linux/
I assume that at some point, providers of DRM-protected content will drop support for old versions of the Widevine CDM library. It looks like that is happening for you now.
I've seen the same happen with the 64bit library - Netflix would stop working and then I would have to upgrade to the latest widevine package from Alien Bob to make playback work again.