An entity type that has no bundle key (i.e. $entity_type->hasKey('bundle') === FALSE) is still able to expose multiple bundles, via hook_entity_bundle_info(). This is a logical nonsense. Not having a bundle key means: this entity type have no bundle (like the user entity type).
Don't allowhook_entity_bundle_info() (and hook_entity_bundle_info_alter()) to populate the bundle info list (see EntityTypeBundleInfo), with more than one entry which is the entity type ID itself, for such entity types.
Eventually consider deprecating such practice in the first step.
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Active
9.5
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This came up as a bug smash daily triage target. Discussed with @catch and we agreed that this is more a DX task than a bug, so moving this to task. If you feel that this logical nonsense leads to actual breaks of things the developer would expect to work, feel free to move this back to a bug.