I did both of these at once last week.
Added a breakpoint. Debugger didn’t break.
Added an echo "here";. Debugger didn’t print.
Added a throw new Exception('fuck');. Debugger didn’t throw.
Stepped through. Debugger wouldn’t let me step in.
It took me almost an hour to realize it wasn’t the debugger’s fault and that a variable I thought was guaranteed to be truthy at that point was actually falsey due to upstream changes in a spreadsheet parser. I felt kind of stupid for not trusting the debugger at that point.
“Oh, they print in that order? That’s weird.”