Fix NavigationRegion3D not reacting to runtime debug enabled change #30879

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 9s
🍏 iOS / Template (target=template_release)	10m 40s
🍎 macOS / Editor (target=editor, tests=yes)	30m 31s
🍎 macOS / Template (target=template_release)	20m 19s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	23m 19s
🌐 Web / Template w/o threads (target=template_release, threads=no)	23m 5s
🐧 Linux / Editor w/ Mono (target=editor)	38m 51s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	19m 50s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	36m 3s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	30m 5s
🤖 Android / Template (target=template_release)	30m 50s
🐧 Linux / Template w/ Mono (target=template_release)	27m 3s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 51s
🏁 Windows / Editor (target=editor, tests=yes)	47m 48s
🏁 Windows / Template (target=template_release)	32m 24s
🪲 Godot CPP / Build and test Godot CPP	7m 10s
	6h 33m 58s

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