I've always typed two spaces after a period - ever since I took typing in HS. (Just over 40 years ago.)
I saw just recently that Microsoft now considers that an error, and also that resume scanning software detects the extra space. "Two spaces after the period on your resume - dude, you're old - much too old for this job."
https://www.theverge.com/2020/4/24/21234170/microsoft-word-two-spaces-period-error-correction-great-space-debate
This article from 2014 basically says the same thing -
Nothing Says Over 40 Like Two Spaces after a Period!
https://www.cultofpedagogy.com/two-spaces-after-period/
So, now I'm struggling with typing two spaces after periods, and then deleting one to "fix it." Am I the only one?