PG editor not decoding as expecting about pg HOT 1 OPEN

When I view that problem in vim I see 'âÂ<90> '. I noticed in my email client (Thunderbird) it shows up the same as here in GitHub. When the problem renders in a set in Firefox on Linux I see nothing. It doesn't even look like there is white space there. When I open this in the PG editor I see what looks like a red dot where that character is, but I see nothing again in the rendered problem.

I am not sure this is an encoding issue. It seems that everything renders this unicode character differently.

I also tested with ␠ (this is cut and pasted from https://www.compart.com/en/unicode/U+2420). This works consistently in vim, the PG editor, and the rendered problem. Then I cut and pasted the character from your first comment in this GitHub thread, and it also works consistently. So it seems that something went wrong in the encoding/decoding process when you cut and pasted it into the problem initially.

from pg.