`ShaderGroup.ShaderGroupBlocksSize` (aka `Unknown_30h`) contains the byte size divided by 16 of the ShaderGroup block and its children blocks, when they are packed contiguously in the resource file.
`DrawableBase.DrawableModelsBlocksSize` (aka `Unknown_9Ah`) is similar but with the size of the `DrawableModelsBlock`.
Incorrect values can cause crashes when the model is unloaded.
Discussed here https://discord.com/channels/329138547833700352/329142468102586368/1139264754767122533