Sync validation fixes (#99) #482

Job	Run time
linux: gcc, VulkanSDK 1.2.198, VMA=OFF	4m 6s
linux: gcc, VulkanSDK latest, VMA=ON	4m 57s
windows: msvc, windows-2019, VulkanSDK latest, VMA=ON	1m 44s
linux: gcc, VulkanSDK latest, VMA=OFF	7m 13s
windows: msvc, windows-latest, VulkanSDK latest, VMA=ON	1m 25s
windows: msvc, windows-2019, VulkanSDK latest, VMA=OFF	56s
linux: gcc, VulkanSDK 1.3.243, VMA=ON	6m 26s
windows: msvc, windows-latest, VulkanSDK latest, VMA=OFF	53s
windows: msvc, windows-2019, VulkanSDK 1.3.243.0, VMA=ON	56s
linux: gcc, VulkanSDK 1.3.243, VMA=OFF	4m 24s
windows: msvc, windows-latest, VulkanSDK 1.3.243.0, VMA=ON	1m 36s
windows: msvc, windows-2019, VulkanSDK 1.3.243.0, VMA=OFF	1m 8s
windows: msvc, windows-latest, VulkanSDK 1.3.243.0, VMA=OFF	1m 42s
windows: msvc, windows-2019, VulkanSDK 1.2.198.1, VMA=OFF	1m 9s
windows: msvc, windows-latest, VulkanSDK 1.2.198.1, VMA=OFF	1m 5s
	39m 40s

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