In the latest WIP release (8.0.23024.12306, 2023-01-24) for macOS, it seems like the Print Color attribute from the Properties: Object sidebar can’t be set for multiple, selected curves. The new setting simply doesn’t stick! I haven’t tested whether other printable geometry types are afflicted.
The curves had custom print colors set, I wanted to revert them all back to “By Layer” Print Color.
When selecting the curves individually, this works fine.
SystemInfo can be found here.