[v25.x backport] util: fix nested proxy inspection #1780

Job	Run time
Build slim tarball	1m 21s
x86_64-darwin: with shared libraries	2h 41m 38s
aarch64-darwin: with shared libraries	1h 38m 57s
x86_64-linux: with shared libraries	2h 20m 31s
aarch64-linux: with shared libraries	2h 15m 56s
	8h 58m 23s

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