Please try again with 2.28.4, wherein I reinstated some trick that ought to help with avoiding double-upgrade.
If it does help, though, I have no explanation for your behavior being observed on ACL and not SBCL.
Please try again with 2.28.4, wherein I reinstated some trick that ought to help with avoiding double-upgrade.
If it does help, though, I have no explanation for your behavior being observed on ACL and not SBCL.