Fix NavRegion sync error messages #13899

Job	Run time
📊 Static checks / Code style, file formatting, and docs	37s
🍏 iOS / Template (target=template_release)	2m 44s
🍎 macOS / Editor (target=editor, tests=yes)	42m 55s
🐧 Linux / Editor w/ Mono (target=editor)	5m 59s
🤖 Android / Template (target=template_release)	5m 48s
🍎 macOS / Template (target=template_release)	22m 38s
🐧 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 3s
🌐 Web / Template (target=template_release)	1m 14s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	9m 19s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	9m 48s
🏁 Windows / Editor (target=editor, tests=yes)	13m 12s
🐧 Linux / Template w/ Mono (target=template_release)	2m 22s
🏁 Windows / Template (target=template_release)	11m 43s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 5s
🪲 Godot CPP / Build and test Godot CPP	13m 52s
	2h 43m 19s

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