Avatars created in 2018 or earlier may have http links to the unity package, this causes endless loading under unity 2022, however works fine under 2019
This also causes anyone on 2022 to get stuck forever loading your avatar even if you swap to one that works, until either one of you rejoin the instance.
Suggest runtime upgrade to https for avatar / world packages.
Example avatar id: avtr_2d89d3a9-bd37-4ca7-9a92-636a2abe9b30