Two integration tests failing because of type mismatch when compiling with current Obsidian Obelisk  #72

I am not understanding what is happening here - I'll try and give as much related information as I can.

I am working on building tahoe-lafs-mobile for iOS.
Towards that, I am in the process of upgrading Obsidian Obelisk, the framework in use.
Current Obelisk employs GHC 8.10.7 (up from 8.6.x) and a few more aged software versions.

Currently, when building the software - which depends on haskell-magic-wormhole - I run into a problem with two integration test failures I do not understand enough to fix myself:

tests/Integration.hs:97:68: error:
    • Couldn't match type ‘HashMap.HashMap k0 v0’               
                     with ‘Data.Aeson.KeyMap.KeyMap Aeson.Value’
      Expected type: Aeson.Object
        Actual type: HashMap.HashMap k0 v0
    • In the first argument of ‘Aeson.Object’, namely ‘HashMap.empty’
      In the third argument of ‘Versions.versionExchange’, namely
        ‘(Aeson.Object HashMap.empty)’
      In a stmt of a 'do' block:
        Versions.versionExchange
          conn sessionKey (Aeson.Object HashMap.empty)

This same error is output twice, once on line 97 and once on line 98.
Looking at the relevant code, I find the only mention of the version test 10 lines up:

I am trying to build with aeson version 2.0.3.0.
My suspicion is that their interface changed somehow; I don't find the change in their changelog nor could I find what this should now look like.

Please find the full build log (output of nix log /nix/store/dj88nh63dczy5s0i69prz459rmd93d7b-magic-wormhole-0.3.4.drv) here: magic-wormhole-test-failure.txt