Node's tokens (Tokens related to individual content items, or "nodes".) are not present in field settings.
This is a problem for example if one want to specify a image path that depend of node:id. Or a default image alt that is the same that the node title.
Fixed
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
For those who stumble on this there is a path token where we could get the node id under Current page > URL > Unaliased URL > Arguments
[current-page:url:unaliased:args:1]
The specific argument of the current page (e.g. 'arg:1' on the page 'node/1' returns '1').