Assertion failure on self-import

Given two files:

A.hs

module A where
import A

B.hs

module B where
import A

A is correctly rejected:

$ ./bin/ghc-stage2 A
Module imports form a cycle:
  module ‘A’ (A.hs) imports itself

B raises an assertion failure:

$ ./bin/ghc-stage2 B
ghc-stage2: panic! (the 'impossible' happened)
  GHC version 9.3.20211001:
	ASSERT failed!
  Build plan missing nodes:
  PLAN: [UnresolvedCycle: [ModSummary {
                              ms_hs_hash = 696e340ec1c794d2136d0fc71d9fc54b
                              ms_mod = A,
                              ms_textual_imps = [(Nothing, Prelude), (Nothing, A)]
                              ms_srcimps = []
                           } []]]

Tested on master, commit e3701815.