Inconsistent assignment analysis for async arrow IIFE's regarding class property declarations (sugar vs constructor assigning)

TypeScript Version: 4.0.0-dev.202000519

Search Terms: async IIFE Property is used before being assigned class declaration

Code

This works fine:

class MyClass {
	public foo = 0;

	constructor() {
		(async () => this.foo + 5)();
	}
}

This, on the other hand, errors:

class MyClass {
	public foo: number;

	constructor() {
		this.foo = 0;
		(async () => this.foo + 5)(); // errors?
	}
}

These two code snippets should be treated the same because the first snippet is sugar for the second.

Expected behavior: (async () => this.foo + 5)() should not have the error "Property 'foo' is used before being assigned."

Actual behavior: It errors

Playground Link: Here

Related Issues:

Start by reproducing the two class examples in the linked TypeScript Playground and compare the assignment analysis for the class-property and constructor-assignment forms. Investigate the handling of async arrow IIFEs and verify that the reported "used before being assigned" error is absent for the constructor-assignment case while the existing behavior remains correct.