I am experiencing this exact issue on Drupal v 10.3.5 - My form exposed as block has auto submit enabled and sort options as the only exposed form option. Adjusting the sort options does not auto submit the form update.
I found with 3.x-alpha6, 3.x-dev and 4.x-dev branches when auto-submit is selected it does not work with drupal 8.7. Though I haven't tried it with 8.6 or earlier but I see there are some similar issues that address that same issue. Per the documentation, in autosubmit.js I added a data-bef-auto-submit attribute where data-bef-auto-submit-full-form is set. This seems to fix the issue.
Fixed
5.0
Code
Not all content is available!
It's likely this issue predates Contrib.social: some issue and comment data are missing.
I am experiencing this exact issue on Drupal v 10.3.5 - My form exposed as block has auto submit enabled and sort options as the only exposed form option. Adjusting the sort options does not auto submit the form update.