[BUG] adjacent italic and underline don't render correctly [9.5.1 (9.5.1-g36086a @ /Users/rob/.emacs.d/elpa/org-9.5.1/)]

[Robert Nikander]

I have:

(setq org-hide-emphasis-markers t)

…and the following does not render right. In the first line I see the ‘_’ 
characters around “underline”, and it doesn’t underline the text.
In the second line, it works correctly. Apparently it needs some intervening 
text (“foo” in this case). 

The first line should work, no?

— begin example org file —
* Test
Mix /italic/ _underline_.
Mix /italic/ foo _underline_.
— end example org file ---