So.....I was incorrect. It EXTRACTS well. But doesn't properly eject.
Disassembly revealed the cause: A missing ejector collar.
Without the collar, there is no forward spring pressure on the ejector, which causes it to NOT contact the cartridge stop, and to NOT push on the lower edge of the case head. Therefore no cartridges can escape the mag tube, and none can eject properly.
Last edited by KiloCharlie; 06/27/23.