util: fix nested proxy inspection #1623

Job	Run time
Build slim tarball	1m 31s
aarch64-darwin: with shared libraries	34m 54s
aarch64-linux: with shared libraries	32m 52s
x86_64-linux: with shared libraries	38m 19s
x86_64-darwin: with shared libraries	2h 40m 45s
	4h 28m 21s

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