Regression coverage for incorrect `loaded` & `progress` stats #2279

Job	Run time
Lint addon	38s
Tests - Floating Dependencies	1m 11s
Tests	55s
Typecheck [email protected]	57s
Typecheck [email protected]	1m 14s
Typecheck [email protected]	57s
Tests - ember-3.25	1m 18s
Tests - ember-lts-3.28	1m 30s
Tests - ember-release	1m 38s
Tests - ember-beta	1m 35s
Tests - ember-canary	1m 12s
Tests - embroider-safe	1m 49s
Tests - embroider-optimized	1m 15s
	16m 9s

Provide feedback