LatestAccessCheck fails with Multiversion Workspaces

It's unclear if this is a problem on the WBM side or the Multiversion side. However, if I create a new Workspace, then going to that workspace's edit tab fails with an exception in LatestAccessCheck:

The website encountered an unexpected error. Please try again later.

Exception: entity.workspace.latest_version is not a valid entity route. The LatestRevisionCheck access checker may only be used with a route that has a single entity parameter. in Drupal\workbench_moderation\Access\LatestRevisionCheck->loadEntity() (line 85 of modules/workbench_moderation/src/Access/LatestRevisionCheck.php).

This happens because in LatestAccessCheck::loadEntity(), there is no parameter for the workspace object. In fact, there's no parameters at all. How that is even possible I don't know. It requires more investigation.