When scrambling gear puzzles using the scramble feature, impossible to solve states can be reached. Observed with Gear Chain (central arrows cannot be solved) and this variation of Double Circle Puzzle which should be M12 (which is sharply 5-transitive), but when scrambled can have 5 pieces solved without the rest being solved.
M12 Gears.txt
When scrambling gear puzzles using the scramble feature, impossible to solve states can be reached. Observed with Gear Chain (central arrows cannot be solved) and this variation of Double Circle Puzzle which should be M12 (which is sharply 5-transitive), but when scrambled can have 5 pieces solved without the rest being solved. M12 Gears.txt