I have 116 GiB of free disk space, that's more than 4*MaxCrashReportsSize.
MaxCrashReportsSize is 25000 MiB.
All crashes never take up more than 2 GiB on my disk before ABRT starts deleting them.
When ABRT starts deleting bugs, it often deletes all of them or all but one even though
the last remaining crash just takes ~16 MiB on my disk.
Still sounds like a bug to me.