Support missing channels across the embedded protocol #2490

Job	Run time
lint	11s
spec (macos-latest, 3.1)	19s
spec (macos-latest, 3.2)	16s
spec (macos-latest, 3.3)	15s
spec (macos-latest, jruby)	1m 1s
spec (macos-latest, truffleruby)	43s
spec (macos-latest, truffleruby+graalvm)	2m 21s
spec (ubuntu-latest, 3.1)	13s
spec (ubuntu-latest, 3.2)	17s
spec (ubuntu-latest, 3.3)	11s
spec (ubuntu-latest, jruby)	1m 28s
spec (ubuntu-latest, truffleruby)	56s
spec (ubuntu-latest, truffleruby+graalvm)	3m 27s
spec (windows-latest, 3.1)	2m 45s
spec (windows-latest, 3.2)	1m 58s
spec (windows-latest, 3.3)	2m 51s
spec (windows-latest, jruby)	4m 55s
spec (alpine-latest, 3.1)	37s
spec (alpine-latest, 3.2)	37s
spec (alpine-latest, 3.3)	30s
release	0s
	25m 51s

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