Just tried it with a new "clean" file and
it worked fine.
Even though I "reset orientation"
(I was in a rotated, saved floor plan view)
in the original file.... it was the angle of the rotation... I think.
EDIT:
Figured it out.
The imported object's orientation aligns to project NORTH.
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)