Fix #14798: internalError on sscanf format string #20370

Job	Run time
build_cmake (alpine:3.23, false, false)	4m 35s
build_make (ubuntu:25.10)	3m 31s
build_cmake (ubuntu:25.10, true, true)	3m 6s
build_make (ubuntu:24.04)	3m 17s
build_cmake (ubuntu:24.04, true, true)	5m 53s
build_make (alpine:3.23)	6m 11s
	26m 33s

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