`invalid sha1 pointer` while doing `git fsck`
Description
Customer is seeing below error after about 2 repository checks.
error: refs/keep-around/1cdfd56f3a14b81a07002483e6688fac05be919e: invalid sha1 pointer 0000000000000000000000000000000000000000
error: refs/keep-around/3795ecf93b66c3b72c86a54aac67b11adb67b578: invalid sha1 pointer 0000000000000000000000000000000000000000
error: refs/keep-around/c854c2145465ca4c613fc3ed2533b48396dbfbe1: invalid sha1 pointer 0000000000000000000000000000000000000000
https://gitlab.com/gitlab-com/infrastructure/issues/773 looks similar but closed already. Any suggestion to get this fixed or make it disappear?
Links:
https://gitlab.zendesk.com/agent/tickets/92878
/cc @chriscool