Support missing channels across the embedded protocol #2489

Job	Run time
lint	11s
spec (alpine-latest, 3.1)	31s
spec (macos-latest, 3.1)	14s
spec (alpine-latest, 3.2)	38s
spec (macos-latest, 3.2)	14s
spec (alpine-latest, 3.3)	36s
spec (macos-latest, 3.3)	19s
spec (macos-latest, jruby)	1m 9s
spec (macos-latest, truffleruby)	1m 7s
spec (macos-latest, truffleruby+graalvm)	2m 24s
spec (ubuntu-latest, 3.1)	12s
spec (ubuntu-latest, 3.2)	22s
spec (ubuntu-latest, 3.3)	12s
spec (ubuntu-latest, jruby)	1m 30s
spec (ubuntu-latest, truffleruby)	56s
spec (ubuntu-latest, truffleruby+graalvm)	3m 22s
spec (windows-latest, 3.1)	2m 20s
spec (windows-latest, 3.2)	2m 16s
spec (windows-latest, 3.3)	4m 1s
spec (windows-latest, jruby)	3m 12s
release	0s
	25m 46s

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