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94a6ba4afb
A modif-tree containing a nil shape id crashed the WASM heap write with "Cannot read properties of null (reading '__u32_buffer')" in propagate-modifiers. Production builds elide the upstream asserts, so a nil id (e.g. update-dimensions called with a missing shape's parent id in the variants flow) reached the uuid heap write. Drop nil-keyed modif-tree entries in apply-wasm-modifiers and set-wasm-modifiers before they reach propagate-modifiers and set-structure-modifiers, filter nil ids at the parse level, and guard the variant reposition/creation events against missing shapes. AI-assisted-by: hy3