The current thread cannot access 'StreamingService' (lacking capability Assistant)

Bug Reports Engine Bugs
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10

Thank you for the report. We’ve identified the issue and expect a fix to ship with the Studio release next week. This issue should only affect Studio sessions and not production servers.

If you need a workaround in the meantime, you can wrap the if statement in a pcall:

for _, v in game:GetDescendants() do
	pcall(function()
		if v:IsA("BasePart") then
			print("Test")
		end
	end)
end
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