5.12.x tags are missing
It appears that v5.12.x tags are missing from fedora-5.12 tree:
Creating linux-5.12.1.tar.xz...
fatal: not a valid object name: v5.12.1
Gathering new log entries since 8ec4598493fe78c81d91d2b08b78d15e27e08a5f
fatal: bad revision '^linux-5.12.y'
MARKER is v5.12.1
fatal: ambiguous argument 'v5.12.1..': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
fatal: ambiguous argument 'linux-5.12.y..': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'
As a result, the created tarball is broken and cannot be built.