Fix crash on changing resource type of dictionary new key/value while editing the resource. #24172

Job	Run time
📊 Static checks / Code style, file formatting, and docs	1m 5s
🍏 iOS / Template (target=template_release)	2m 45s
🍎 macOS / Editor (target=editor, tests=yes)	5m 50s
🍎 macOS / Template (target=template_release)	3m 14s
🤖 Android / Template (target=template_release)	4m 37s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	4m 53s
🏁 Windows / Editor (target=editor, tests=yes)	14m 10s
🌐 Web / Template w/o threads (target=template_release, threads=no)	4m 40s
🐧 Linux / Editor w/ Mono (target=editor)	5m 12s
🏁 Windows / Template (target=template_release)	10m 56s
🐧 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)	22m 30s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	7m 4s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	7m 53s
🐧 Linux / Template w/ Mono (target=template_release)	1m 47s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 27s
🪲 Godot CPP / Build and test Godot CPP	7m 5s
	1h 45m 8s

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