OAuth2 suddenly started failing with "Unable to load conversation undefined"

I’m making my first Custom GPT and I got a custom Action to work as well. However, after making a few changes, the Action’s OAuth is constantly failing with “Unable to load conversation undefined” error.

What could be going wrong? How to debug and fix this?

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Also having this issue, not a new problem. Surprised there are not more posts about this as it is entirely blocking usage of a critical gpt for us. Was working fine until we updated a custom action, now OAuth fails every time across devices and browsers. Reverting to the previous action code did not fix it, seemingly no way to fix from our end

EDIT: Deleting and re-creating the CustomGPT solved the issue, though this is not a reasonable long term solution

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I am getting the same issue with Custom Actions / GPTs:

Unable to load conversation undefined

This is a total pain.

Custom Actions are unreliable