property panels: fix use-after free #1538

Job	Run time
stylecheck	18s
build-arch (all)	14m 37s
build-arch (horizon.so)	4m 34s
build-pr-review	3m 35s
build-opensuse (all)	13m 57s
build (ubuntu:focal, g++, gcc, all)	16m 38s
build-opensuse (horizon.so)	4m 43s
build-debug	14m 51s
build (ubuntu:focal, g++, gcc, horizon.so)	4m 37s
build (ubuntu:jammy, g++, gcc, all)	12m 49s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 13s
build (ubuntu:lunar, g++, gcc, all)	15m 1s
build (ubuntu:lunar, g++, gcc, horizon.so)	4m 38s
build (debian:bullseye, g++, gcc, all)	12m 58s
build (debian:bullseye, g++, gcc, horizon.so)	4m 18s
build (debian:bookworm, clang, clang, all)	13m 27s
build (debian:bookworm, clang, clang, horizon.so)	4m 20s
build (debian:bookworm, g++, gcc, all)	14m 28s
build (debian:bookworm, g++, gcc, horizon.so)	4m 35s
	2h 48m 37s

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