Exit not working in Holiday Lemmings 1994 - Frost 07 - "Happy New Year!"

[Futeko]

It seems the exit in the Frost 07 level of the Holiday Lemmings 1994 pack ("Happy New Year!") does not work.
At first I thought it was a fake exit and the real one was hidden somewhere, but from digging around and looking at guides it doesn't seem to be the case. The one visible on the map should work - but Lemmings just walk past it.

I attached a screenshot showing the Lemmings walking past, and a replay of that particular run.

Am I missing something or is it a bug in the map?

[Proxima]

Could be that the trigger area is set too high. Will the lemmings go in if you use a builder at the bottom centre of the exit?

[Futeko]

I had tried that (thinking the platform was too low for the Lemmings to reach the exit) but sadly it did not work.
However, that mention made me realize I did not try the opposite - digging in case the exit trigger was set too low. And in fact it is - after digging one pixel under the exit, the Lemmings were able to go through. So the exit just need to be set one pixel higher

I attached the modified, now successful run.

Thank you very much for the advice in any case!

[Tsyu]

I know what's happening here. In the original games, trigger areas are always locked to a 4x4 grid. Almost all original levels account for this by also aligning object positions to the same 4x4 grid, but this level does not do this with the exit object, so the game moves the trigger area slightly up and left so it's aligned to the grid. This raises the trigger area enough for the lemmings to exit without digging.

SuperLemmini, on the other hand, does not have this restriction, so the trigger area stays buried. The next version (which should be out within the next few months) will have a fixed version of the level, with the exit raised slightly.