https://tracker.ceph.com/issues/70746 tracks a data loss bug on squid when CopyObject is used to copy an object onto itself. S3 clients typically do this when they want to change the metadata of an existing object. Due to a regression caused by an earlier fix for https://tracker.ceph.com/issues/66286, any tail objects associated with such objects are erroneously marked for garbage collection. This regression was introduced with the initial 19.2.0 squid release and is still present in 19.2.1. There is no workaround to prevent clients from triggering this bug, so we're preparing 19.2.2 as a hotfix release to resolve this as soon as possible.