example command "AltMovement move this forward 1 skip" causes crash

[TouringBus]

I'm running RMMV 1.6.2, using a blank project with just pixel movement and pixel movement debug. I've been going through the example plugin commands to try to get a better feel for the plugin, and I've found that using the example code

AltMovement move this forward 1 skip

Causes the game to crash with a "ReferenceError subject is not defined" error popup.

The issues seems to be with the 'forward' command rather than a bigger problem with using 'this' as a self-reference. This example, for instance works perfectly, just as expected:
AltMovement move this 9 0.5 # Moves current event upper-right 0.5 units

However, when using 'forward', I still get the same crash if I replace "this" with the name of the NPC in quotes, like so:

AltMovement move "testevent" forward 1 skip

or replace it with "player" instead. Similarly, removing 'skip' doesn't help anything either.

[SynthKittenDev]

Same issue, might not work well with YEP_Core + YEP Doodads as well, look into it if your active dev.