Step over (F10) functionality does not work anymore in 12.31?

When I debug my scripts, I tend to use the F10 & F11 keys to go through the scriptlines 1 by 1. F10 to step over an entire function or loop, F11 to step into each line.

The step over functionality doesn't seem to work; it functions like the step into action.

(note that it's not the shortcut keys that don't work, it's the buttons on the toolbar itself that have the same result)

Is someone having similar problems?

Example:

for (var i = 0; i < 5; i++) {
   Delay(1000);
}

for (var i = 0; i < 5; i++) {
   Delay(1000);
}

If have a breakpoint at the first for statement, I expect to move to the second for statement when I use step over. Instead, it goes into the loop.