Try changing the "Background Fill" to something like... "solid fill".
EDIT:
I believe it works with fills that have Opacity [%] (fill appearance) set to 100 (my "solid fill" is @ 100).
If the fill's Opacity is 0... then you'll get a black fill.
Marc Corney, Architect
Red Canoe Architecture, P. A.
Mac OS 10.15.7 (Catalina) //// Mac OS 14.5 (Sonoma)
Processor: 3.6 GHz 8-Core Intel Core i9 //// Apple M2 Max
Memory: 48 GB 2667 MHz DDR4 //// 32 GB
Graphics: Radeon Pro 580X 8GB //// 12C CPU, 30C GPU
ArchiCAD 25 (5010 USA Full) //// ArchiCAD 27 (4030 USA Full)