When selecting a node as frontpage, 403 or 404 page. The node context isn't activated when using the special metatag context.
Using only node context, isn't working for the frontpage, because editors than needs to update all the metatag info manually for the frontpage. The same goes for 403 and 404 pages that have a node.
In the end, the optimal case would be that an editor has only to set certain metatags like 'noindex' and nothing more.
Replace the special page or node context check with a merge.
Editing a node will show the following metatag info in order of enabled contexts
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Needs review
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I believe this issue is fixed in the 2.x branch. I had upgraded to 2.0.0 and when this patch applied it caused some issues I erroneously reported in issue 3460855.