[15:37] <ChrisTownsend> Hi fm2350!  Just to follow up on our previous conversation, macOS 13.4 did indeed break this with it's more strict System Integrity Protection.  I have filed a Multipass bug at https://github.com/canonical/multipass/issues/3145 and the only workaround at the time is stated by a user at https://github.com/canonical/multipass/issues/2417#issuecomment-1553437799.
[18:34] <fm2350> Hi Chris,  I just saw your github comment about issue 2417.  Thanks.  I'll try it out tonight.