On 8.x-1.0-beta4 version, the 'Add new comment' link doesn't work, when clicking on it, nothing happens. On the dev version this changed, because of a js fix, so on dev version the link goes to the add new comment page, but the comment form is not loaded via ajax.
I only found a similar issue for D7, I linked that ticket as possibly related.
1. Add a comment field to a content type.
2. In the comment field settings, uncheck the checkbox next to: 'Show reply form on the same page as comments'
3. Visit a node created in this content type, there is a link 'Add new comment' on the top right content area. (Because of the config set in 2. the initial comment form is not displayed by default, instead this link is displayed.
4. Clicking on the link doesn't do anything (on 8.x-1.0-beta4), or on current dev version it loads the new comment page, but not via ajax.
Load comment form through AJAX when 'Show reply form on the same page as comments' is disabled in the comment options
Needs review
1.0
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It's likely this issue predates Contrib.social: some issue and comment data are missing.