Hi Alfred,
Looks like the tag v6.16-prjc-r0 is pointing at the latest commit in linux-6.15.y-prjc: 6eeeba53
It should be pointing at the top commit of linux-6.16.y-prjc: 87f020d2
The 6.16 branch itself works fine and is in use with Zen Kernel, only the tag needs a force push to the right commit.