BUG Report: Too many Pixel Map Layers causing Issues with plots

Good Afternoon! First off, this issue seen in v3.12 on a rig with a FB4, 2 RH4s, and a Rackhog. all systems show this issue.

My 2nd unit Programmer went a little crazy patching pixel map layers (originally had 14 layers, he added 18 more for a total of 32) and at the same time the pixel mapper in plot view started acting very strange. Strange meaning when selecting already created plots with layers patched, the layers window where you select what layers are mapped to the pixel map is greyed out with no layers visible. The same behavior is made worse when creating new plots and trying to add layers.

Earlier versions of the show file with fewer layers do not exhibit this issue, removing the excess layers in the current file does not fix.

I'll happily send in backup file for inspection.

-Elton