Probably not the reason, but worth to do a quick check:
Sometimes the update cache interferes, so if something's odd with updates - some module (or core) claims to have updated, but then...
The issue with checking for updates in the BackdropCMS dashboard makes website development and maintenance more difficult. I manage more than ten websites hosted by two different providers, one...
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@stpaultim doesn't https://github.com/backdrop-contrib/addressfield work for you?
It doesn't say in the module that it works for Webform as well. Maybe this module needs to be ported https://www.drupal.org/project/addressfield_tokens. It mentions that it adds Webform support.