Keyboard Maestro Version 10.1.1
It looks to be a misstep of the feature that allows you to type modifier symbols by pressing and releasing them in the Search Field.
Note that you can use Command-F twice to get the same result and I don't believe it tickles this issue.
Thanks, I use Command-F twice and everything works fine.
Fixed for the next version.
I did not know that. This is entirely helpful, thanks!