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Partial fix for #15048 Inconsistent error severity for uninitvar #21343

Job	Run time
build_cmake (ubuntu:25.10, true, true)	3m 13s
build_make (ubuntu:24.04)	3m 20s
build_make (alpine:3.23)	4m 59s
build_cmake (alpine:3.23, false, false)	5m 8s
build_cmake (ubuntu:24.04, true, true)	2m 20s
build_make (ubuntu:25.10)	3m 15s
	22m 15s