Merge branch 'dev-fallback-backend' into next #3445

Job	Run time
macOS / Release / homebrew-clang	6m 38s
Windows / Release / cl	29m 46s
Ubuntu / Release / gcc	20m 4s
macOS / Debug / homebrew-clang	5m 10s
Windows / Release / clang	27m 22s
Ubuntu / Debug / gcc	17m 11s
Windows / Release / clang-cl	24m 55s
Ubuntu / Release / clang	16m 45s
Windows / Debug / cl	25m 8s
macOS / Release / system-clang	5m 55s
Ubuntu / Debug / clang	13m 29s
Windows / Debug / clang	25m 11s
macOS / Debug / system-clang	4m 15s
Windows / Debug / clang-cl	25m 21s
	4h 7m 10s

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