Why does go.exists() require a different url from msg.post()?

Questions
5

Yeah, the way my library code works, each step is tried until it succeeds or we run out of time for the test case:

	case.GameTestCase_can_load_a_collection_under_test = function(self)
		-- Given
		local proxy = "/tests#testproxy1"
		self.util.loadCollection(proxy)  -- step 1: load collection
		self.gassert.receivedMessage(hash("proxy_loaded")) -- wait for proxy_loaded event
		self.util.initCollection(proxy) -- step 2: send init & enable events

		-- When Then
		self.gassert.gameObjectExists("undertest:/xunit_is_cool") -- wait for assert to become true
	end

EDIT: fix to show non-working assert above.

This runs 3 seconds and times out:

DEBUG:SCRIPT: Suite: Game Tests Suite
DEBUG:SCRIPT:   GameTestCaseTests.GameTestCase_can_load_a_collection_under_test: FAIL (3.013s; 217 frames)
DEBUG:SCRIPT:     Timed out, last error: main/xunit.script:194: Expected 'undertest:/xunit_is_cool' to exist
DEBUG:SCRIPT: 1 run, 1 failed

Which I think is enough time, because in the case with the working url it completes very quickly:

DEBUG:SCRIPT: Suite: Game Tests Suite
DEBUG:SCRIPT:   GameTestCaseTests.GameTestCase_can_load_a_collection_under_test: OK (0.066s; 5 frames)
DEBUG:SCRIPT: 1 run, 0 failed