I think William tried to answer this on Stack - https://stackoverflow.com/questions/70633149/even-if-my-azure-widevine-license-has-expired-i-can-still-play-content
I believe he may be correct - you probably are not on a device or environment that supports persistent licenses for Widevine.
Without persistent license support, the client will just keep asking for a new license. It thinks it never got it before, so it loads a new fresh license and keeps going.
A lot of devices do not support Widevine persistent - so you need to look into that or contact Google/Widevine to understand the issue better.