fix: don't hide typecheck errors inside diff processor #7519

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Run time

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Job	Run time
go-mod	10s
golangci-lint	54s
check_generated	53s
tests-on-windows	9m 5s
tests-on-macos	6m 17s
commands	55s
tests-on-unix (1.21)	3m 8s
tests-on-unix (1.22)	3m 50s
	25m 12s