This issue happens intermittently. I am not able to add Github details such as PR's, branch etc. or even view those details present in a trello card. As you can see below, it says loading, and does not show the github details.
Sorry to hear this is happening for you. Could you try the below things to see if any of them help you solve the problem?
If none of those help, show a few screenshots of any errors that appear in the developer console when the card is loading? Also, does this happen for all cards with GitHub attachments, or only certain GitHub links?
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