mux: validation fixes #23521

Job	Run time
LP64-WIP	3m 52s
build-windows (mnfst, mtl)	8m 55s
build-windows (mnfst, imx8m imx8ulp)	9m 19s
build-windows (mnfst, imx8 imx8x)	10m 10s
manifest-check	2m 42s
build-linux (mnfst, wcl imx95)	7m 21s
build-linux (mnfst, mtl)	4m 35s
build-linux (mnfst, lnl)	4m 25s
build-linux (mnfst, imx8 imx8x)	4m 59s
build-linux (mnfst, tgl-h)	4m 8s
build-windows (mnfst, tgl-h)	8m 23s
build-windows (mnfst, lnl)	9m 13s
build-linux (mnfst, imx8m imx8ulp)	4m 51s
build-windows (mnfst, ptl)	11m 46s
build-windows (-d, mnfst, lnl)	8m 51s
build-linux (mnfst, tgl)	4m 28s
build-linux (-d, mnfst, lnl)	4m 27s
build-linux (mnfst, ptl)	5m 52s
build-windows (mnfst, tgl)	9m 4s
compare-linux-win	25s
	2h 7m 46s

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