Fix serialization of StandardDynamicAsset #678

Job	Run time
progress-tracking-test (windows-latest)	15m 29s
lint	1m 8s
progress-tracking-test (ubuntu-latest)	5m 43s
test (windows-latest)	4m 3s
progress-tracking-test (macos-latest)	6m 12s
test (ubuntu-latest)	3m 20s
test-2d-3d-dynamic (windows-latest)	14m 7s
test (macos-latest)	2m 17s
test-2d-3d-dynamic (ubuntu-latest)	3m 48s
test-2d-3d-dynamic (macos-latest)	5m 36s
	1h 1m 43s

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