It looks like the condensed post view search zero results message has regressed
Relevant error message, similar to previously:

You haven't created any content yet.

Chrome macOS
Thanks for the report, CC @Automattic/tanooki
The message differs depending on whether in single site or All My Sites mode...
All My Sites mode:

Single site mode:

The single site mode message is not incorrect. But, it is less clear than the previous message, since it no longer references a search or the query.
It would be good to change this message to be more informative.
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