bug#61885: `guix import go` fails outside of pre-inst-env

[winter]

Hi,

As of commit ec8c7370dfd66136f7cb517d31fa6fda31e2cb74, the following `guix 
import` invocation fails:

$ guix import go --recursive github.com/tdewolff/minify/v2
Backtrace:
In ice-9/boot-9.scm:
  222:29 19 (map1 _)
  222:29 18 (map1 _)
  222:29 17 (map1 _)
  222:29 16 (map1 _)
  222:29 15 (map1 _)
  222:29 14 (map1 _)
  222:29 13 (map1 _)
  222:29 12 (map1 _)
  222:29 11 (map1 _)
  222:17 10 (map1 (((gnu packages check)) ((gnu packages #)) ((…)) …))
 3327:17  9 (resolve-interface (gnu packages check) #:select _ # _ # …)
In ice-9/threads.scm:
   390:8  8 (_ _)
In ice-9/boot-9.scm:
 3253:13  7 (_)
In ice-9/threads.scm:
   390:8  6 (_ _)
In ice-9/boot-9.scm:
 3544:20  5 (_)
  2836:4  4 (save-module-excursion _)
 3564:26  3 (_)
In unknown file:
          2 (primitive-load-path "gnu/packages/check" #<procedure a…>)
In gnu/packages/check.scm:
 1037:13  1 (_)
In ice-9/boot-9.scm:
 1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
error: go-github-com-robfig-cron: unbound variable

Strangely enough, it does work inside pre-inst-env with that same commit:

$ ./pre-inst-env guix import go --recursive github.com/tdewolff/minify/v2
(define-public go-github-com-djherbis-atime
<...>

I'm very unsure as to why this is happening, as `(gnu packages golang)` is 
imported in `(gnu packages check)`. Plus, even more weirdly, `guix build` can't 
find the problematic package, but can build the one that depends on it:

$ guix build go-github-com-robfig-cron-1.2
guix build: error: go-github-com-robfig-cron-1.2: unknown package
$ guix build actionlint
/gnu/store/0nzn1lbq02mfp6ka7z34lp9ly5nhlrv4-actionlint-1.6.23

I'd appreciate any help tracking down what could possibly be wrong here, as 
it's very puzzling.

Thanks,
Winter