[BUG][RC-PLAYER] 12.10 RC: crashing bug

[Proxima]

On a fresh install of the RC, after the following actions:
* Delete the levels that come packaged with the RC
* Copy Lemmings Redux into the levels folder
* Open NeoLemmix (Gentle 1 is selected)
* Go to the level preview screen
* Press up (selects Quirky 1)
* Press down

NeoLemmix crashed with the error message shown.

[namida]

Confirmed that I can reproduce this in RC1 and that it no longer happens for me in RC2. Let me know if this resurfaces.

One particular bug in RC1 related to the preview screen in levels that have talismans, in packs that do not use custom talisman graphics. This slipped under the radar because of how late before RC release it got introduced. I didn't specifically investigate if that was the problem here, but Quirky 1 is the sort of level where it would happen and it no longer happens after fixing that bug, so that's my guess here.