The entity_usage modules provides an implementation for tracking block references using the block field, however in case of using a webform block that only tracks the usage of the webform block itself, but not which webform is being linked by it.
Reference the webform block through a block field.
Reference a specific webform from the webform block from above.
Enable the tracking of webforms as target and the parent entity of the block field as source in the entity usage settings.
Update the usage statistics.
Check that no usage statistics have been gathered for the referneced webform by visisting admin/content/entity-usage/webform/{webform_id}.
Add a new plugin extending from the Block Field one for tracking webforms by checking whether the underlying block is a webform_block and if so retrieving the webform ID being referenced.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
silvi.addweb → made their first commit to this issue’s fork.
I have tested this patch and it's working fine for me and also raised MR for the same.