Merge of vendor/openzfs/zfs-2.1-relesae to stable/13 forbidden

Hello,

there has been probably some change in configuration as I am not allowed 
to merge vendor/openzfs/zfs-2.1-release to stable/13 anymore.
Please could anyone responsible take a look at this?

remote: ================================================================
remote: Currently only allow merge from vendor/* to main
remote: ================================================================
remote: FATAL: VREF/MERGE-CHECK/src: helper program exit status 256
remote: error: hook declined to update refs/heads/stable/13
To ssh://gitrepo.FreeBSD.org/src.git
  ! [remote rejected]           stable/13 -> stable/13 (hook declined)
error: failed to push some refs to 'ssh://gitrepo.FreeBSD.org/src.git'

Thanks
mm