Correct Sub boot problem related to default parameters #36302

Job	Run time
build (base)	2m 36s
build (clang)	2m 9s
autotest (sitltest-rover)	17m 40s
autotest (sitltest-sailboat)	3m 0s
autotest (sitltest-balancebot)	8m 0s
	33m 25s

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