Does the model get garbage collected even if a descendant part is in LuauHeap’s unique references (aka not garbage collected)? There are parts in some vehicles that aren’t being garbage collected (from an unrelated issue), but I’m not sure if it’s just the part itself or the whole model that isn’t garbage collected.
It depends. First off you should understand that garbage collection occurs every frame, but it will only collect after .Destroying, if .Destroying or any event connected to the instance is being held up or yielded, it’ll prevent the collection. So look through the code that references it, and make sure no connections are being yielded. Consider also using a Janitor, or maid class.
Yes I understand that. All I’m asking is if the part prevents the whole model (and ancestor models) from being GCed.
I would assume that it keeps the model from being GC’d, I’m unsure about the rest of the children, but it will keep the parent in memory until it can properly be cleaned up.
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But I don’t believe it’d keep the other parts from being Destroyed. (As long as they aren’t obviously connected to a conection.)
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Ah alright. Thank you for the help!
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No worries, have a blessed rest of your day/night. God bless 
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Make sure to mark it as solved so people don’t still think you need help, unless you want further confirmation.