Sticky Tiles not quite sticky enough?

I was really looking forward to the sticky tile feature in v3.2, and in the Beta it seemed to be exactly what I was looking for - now I'm kicking myself for not thinking to try this...

I have an adventure site that has four floors, and I planned to use the sticky tile feature to present my players with one integrated map of layered (100% overlapping) tiles with enemies separated according to layers. When I tested this in the beta, everything seemed fine, but I neglected to test what would happen with an overlapping map setup like this after the program is closed and re-opened. Much to my dismay, today, I have discovered that in this case, all creatures gravitate to the top-most layer on the map, essentially "forgetting" their original layer-affiliation on the re-opened map.

To be honest I'm not sure if this is a bug or working as intended, but either way it's a slightly sad discovery for me that suggests I'll need to either run a much larger unlayered map, make 4 maps, or not have the creatures pre-placed on the map. Given that Fog of War has no present layer-affiliation, I suspect that making 4 maps is the best solution for me.

Creatures not retaining sticky-tile affiliation in the case of overlapping sticky tiles seems like it might be a bug; giving FoW polygons the ability to flag sticky-tile affiliation would be additional gravy.

Sorry I missed these thoughts during the Beta.