vcswatch reports that
there is an error with this package's VCS, or the debian/changelog file inside
it. Please check the error shown below and try to fix it. You might have
to update the VCS URL in the debian/control file to point to the correct
repository.
fatal: bad revision 'fb27316a2ce36d66fcfd51fdc95ebdbebfdbed34'
error: https://salsa.debian.org/gspr/optuna.git did not send all necessary objects
fatal: could not fetch fb27316a2ce36d66fcfd51fdc95ebdbebfdbed34 from promisor remote
fatal: fetch-pack: invalid index-pack output