Editor does not create new Post IDs

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I’m encountering a rather strange problem: When I add a new post in the backend, it overwrites the former post (ID) and its contents with the new contents. The post ID simply does not change any more.

I have tested with all Plugins switched off and using a standard wordpress theme. No change in behaviour. I have replaced the wordpress core files with a new installation.

The only thing I remember is, that I had installed Gutenberg and then reverted to Classic editor. So now I’m with Classic editor again. This may have caused the problem (or not.)

Thanks for suggestions