GPTs: UI Update Hides OAuth2 Callback URL; was this a leak?

I was building my first GPT (an idea I have had for a while, which uses an authenticated function call) and was configuring OAuth2 flows.

In the middle of this, the UI changed, and now the OAuth2 callback URL is no longer visible.

Is this an intentional update or an oversight? I would really appreciate some clarity here. Pretty annoyed that I wasted a couple hours on this only for it to disappear.

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Same here. The UI changed on me and now I can no longer add new actions or edit my existing actions. Hopefully this is a bug that will clear up soon.

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It looks like you can still change actions but you have to do it through the OpenAPI definition. The syntax is reasonably simple.