Import suggestions don't work in GHCi

Summary

While working on !5763 (closed), I noticed that GHCi doesn't report suggestions about adding things to the import list and similar suggestions, for example:

import Control.Monad (sequence)

x = guard

results in

     Variable not in scope: guard
     Perhaps you want to add ‘guard’ to the import list
      in the import of ‘Control.Monad’ (T19843j.hs:3:1-31).

when compiled with GHC or loaded into GHCi via :load, but when the same code is entered directly in GHCi, the error message is merely

    Variable not in scope: guard

This happens because at the point the error reporting functions are called in GHCi, calling getImports to get the imports from the TcM results in an empty ModuleEnv. I've tracked this up to reportUnsolved, at which point it's already the case that getImports via GHC finds the imports, but getImports via GHCi doesn't. I'm not sure though how to find the cause of this discrepancy from here.

Environment

• GHC version used: 9.3.20210513

Optional:

• Operating System: Arch on WSL2 on Windows 10
• System Architecture: x86_64