'Everyone turn left' is impossible

[Minim]

Stumbling across random Genesis levels here in the Extras pack. Unfortunately, the levels 'Everyone turn left' (Fire version) and its sequel 'Everyone turn left (Part 2)' are now impossible to solve because under the updated NeoLemmix mechanics the lemmings can't mine a one-way arrowed floor in the opposite direction. Only a minor thing, but still worth mentioning.

[namida]

An impossible level is hardly a minor (or should I say miner?) thing.

The general way to fix this would be to make the one-way arrows not extend right to the top of the terrain.

I believe "Just A Minute (Part 3)" is also affected by this, based on what I vaguely remember from a discussion in the Redux project topic.

[Minim]

Yep. I can confirm that Just A Minute (Part 3) is also affected. Well spotted.