The 4.0.x branch drops support for versions of Drupal prior to 9.1. It still contains code that provides compatibility with earlier versions.
Remove code that provides compatibility with versions of Drupal prior to 9.1.
Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Talked to rlhawk at Drupalcon about versioning, and its likely a new version is not likely anytime soon due to the downstream dependencies. Thus moving this back.
As of Q2 2025, the minimum version can be safely set to Drupal 9.5 without needing to change the major version.