Protesilaos Stavrou <info@protesilaos.com> writes:

> Do you get the same results?

Oh, I do!  That said, if I reverse last two steps, I do not:

> - Create a file with demo content, such as ~/test-org-block.org
> - Execute 'emacs -Q' on the command-line.
> - M-x load-theme RET modus-operandi
> - C-x C-f test-org-block.org RET

Then, I get: