Claude Code shows a warning when it drops certain cross-certificates from your list of CA certificates. CA certificates are what Claude Code uses to decide which secure connections to trust. The warning used to say that setting CLAUDE_CODE_DISABLE_LOOPED_CROSS_CERT_DROP=1 keeps them all. It no longer mentions that variable.
It now says that a server which sends the named cross-certificate itself, after its issuing CA, needs no copy of it in the list.
Why
The environment variable is no longer pointed out to you. The new advice tells you when a dropped certificate does not need to be in your list at all.