Alright, thanks for feedback. Will try what @crashdome suggested instead.

Yeah, no dice. Tried it wrapped, tried w/ calling a setter instead of using set... All to no avail. Remains broken.

Nice detective work. I also found only the CTOR affected, but - sadly - whether scheduled or unscheduled, the error persists. (The code in the attached map was my actual second attempt; the first was without spawn()).