Unable to generate solution with ios, macos or android enabled

## Background
Our tooling allows us to generate a solution with specific MultiTargets enabled. These consist of uwp, wasdk, wasm, wpf, linuxgtk, android, ios and macos.

## Problem
Something recently changed under us and solution generation is no longer working as expected when android, ios or macos are enabled. This issue has been [mitigated](https://github.com/CommunityToolkit/Windows/pull/580) for the bulk of our users, but any attempt to generate a solution with ios, macos or android enabled will continue to fail. CI doesn't appear affected by this.

## Solution
Needs investigation