Please switch from â€œAttach postâ€ to â€œShare Postâ€ until we release a solution.
I have the same issue and switching to â€œshare postâ€ didnâ€™t help.
Sorry, but it’s not possible. Only attached posts use actions.
Shared posts do not use actions, so it’s not possible to get “[ERROR] (#100) actions should be a JSON-encoded” error when using shared posts.
Anyway fix will be released later today.