Text in square brackets disappearing

Testing Brackets - behind each colon is the text “this works”, bracketed by respective “brackets”:

Parenthesis (round brackets): (this works) !
(Square) Brackets: [this works] !
Braces (curly brackets): {this works} !
“French” brackets/quotes (double arrows): «this works» !

Some brackets have special meaning within the CC text editor (such as square brackets followed by parenthesis indicating a link address and text). So precision might be crucial here…

@CC_Jon Reproducible. (even from desktop computer)
The message will “post” seemingly correctly, from editor into the “live” page.
BUT, if the browser is REFRESHED, and the page rendered anew, THEN the full page rendering will indeed suppress bracketed text.