G38.2 Weird behaviour

There is a new release (2.9.10) that reverts this change.
Unfortunately it's not yet available from our repository as I am having trouble with the archive signing key.
However, you can manually install .deb files from here:
github.com/LinuxCNC/linuxcnc/releases/tag/v2.9.10

I see you have withdrawn 2.9.9.
I tried an "apt-get clean; apt-get update; apt-get upgrade", but still get:
E: Failed to fetch www.linuxcnc.org/dists/bookworm/2.9-uspa...pace_2.9.9_amd64.deb 404 Not Found [IP: 69.163.143.134 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

Is this related or an issue on my side?

'2.9.9_amd64.deb ' cannot be fetched because it has been removed. If you want to update to 2.9.10 use the link to the deb file posted by andypugh