rice embed-go doesn't work for go modules beyond v1?

[arosenberg-fubo]

The rice embed-go command worked while my go.mod package was in v1. However, after upgrading my go.mod file so the module is using the /v2 suffix, rice embed-go now fails with "error creating embedded box file: open <v1 package path>/rice-box.go: permission denied", where "v1 package path" would be my package's v1 directory under my $GOPATH/pkg/mod.

Is this expected or am I missing something obvious?