We're currently attempting to restore this important API and correct
some sources of data loss. If you develop a viewer or viewer-like
library, there is potential for protocol drift having consequences.
So, we've stood up a few regions on the Beta grid and are encouraging
testing. A post on the forums gives more information on what is
happening and what to look for:
https://community.secondlife.com/forums/topic/519841-restoring-eventqueueget/