2 items are both named Share in the Quick Menu Customizations. The square box looks to collapse comments to that level, not sure what its real name is.
Unfortunately custom post quick actions will need to be its own feature however it should be a lot easier to implement since the comment actions are done. I'll add it to the backlog.
Thanks for catching that bug. The second action should read "open comment". It will open the post with the selected comment as the "base".
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