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If a child anim BP is made and is saved without saving its parent, then when the class is reloaded later it will not be able to find the parent's sparse class data in the linker (as it will have been generated again from scratch on load, which doesnt patch the linker until the asset is resaved). This leads to serialization size mismatches. To address this (and because the sparse class data will always be regenerated as part of compile-on-load), we skip the portion of the CDO's archive that represents the serialized sparse class data if it is null after serialization. It can of course be legitimately null in a lot of cases (say a regular actor Blueprint), but this should have no ill effects and effectively be a seek to the current archive offset. This CL also fixes a number of child anim BP-related issues. First of all it prevents a crash when accessing out-of-bounds AnimNodeData by ensuring it is correctly duplicated in all circumstances. It also correctly propogates values from root->child sparse class data (in the same manner that anim node data used to be propogated before). This deals with compile-on-load issues where the child classes sparse class data is regenerated without serializing the parent classes sparse class data (see crash fix above). #jira UE-114674 - Creating a new child anim BP crashes #ROBOMERGE-SOURCE: CL 16313070 in //UE5/Main/... #ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v804-16311228) [CL 16313076 by thomas sarkanen in ue5-release-engine-test branch]