Previous anim frame -> crash

I have an empty frame with a loopable animation, active using the default 8-direction movement, and a counter which is not set to display as bkg.

Other than the usual "press esc -> end application" etc, I have only:

Start of frame -> pause anim
Active collides with animation -> previous frame
Active collides with counter -> previous frame

If the Active collides with anything, the application freezes completely.

Slightly changing it to

Start of frame -> pause anim
Active collides with animation -> next frame
Active collides with counter -> previous frame

just makes it not work (although again, if the Active collides with the counter first, the thing hangs). Next frame works normally!

Found this post while looking for something else and out of curiosity decided to check whether it still crashes in the current build.

...and no it doesn't! Still, the Animation object still can't handle the "Previous Frame" command ("Next Frame" works normally though).

For example try this:

+Start of frame
=Create object "Animation" at (some coordinates)
=Set "Animation"'s file to apppath$+"filename.gif"

+Upon pressing the Left Arrow
="Animation" next frame
=Play sample "beep.wav"

+Upon pressing the Right Arrow
="Animation" previous frame
=Play sample "beep.wav"

the previous frame gets ignored (although the beep can be heard).

While we're at it, why does the Animation object throw an error as soon as the application starts >_<