Cannot add new release to an old API version

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My question: Why can’t I create a new release for an old API version? I got the following error

No revisions found for modelId: < model-id-here >.
I already searched for it on the Internet, but I found no information.

Details (like screenshots):


How I found the problem:

I tried to create a new release. I added a new endpoint to the API, updated the documentation and now I want to update the published one. I tried creating a new release, but I got this error.

I’ve already tried:

I tried creating a new release for newly created API and everything worked as expected, however for the old one - I get the aforementioned error - No revisions found for modelId: < model-id-here > . I don’t understand what this error means and how could I fix it.