This Macro Often Doesn't Work

Questions & Suggestions
1

Keyboard Maestro 8.2.4 “Activate Previous Application” Macro

Sometimes this works great but other times, it won't trigger. I test by just moving the cursor right and left repeatedly.

Is there some nuance I'm missing?

Thanks.

Activate Previous Application.kmmacros (1.4 KB)

Keyboard Maestro Export.png1312×762 60 KB