PHP8: All new blog entries appear to be in the draft state by default

There were several blogs-related behat failures on PHP8 and I traced them down to the fact that in PHP8 by default the "Publish to" field equals to "Yourself (draft)", where in PHP7 it is set to "Anyone on the site"

This seems to be the same issue as MDL-70966

var_dump('site' == 0);

results in:

Output for 8.0.0 - 8.0.3

    bool(false)

Output for 7.3.0 - 7.3.27, 7.4.0 - 7.4.16

    bool(true)

See https://3v4l.org/3qVO3