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The `SegmentedGraph`'s draw node would call `getSegmentColour()` on the drawable, which would query the `DrawColourInfo` and `tierColours` properties of the drawable. This is a cross-thread access and as such completely unsafe, as due to being cross-thread it can die on invalidations or out-of-bounds accesses. Fix by transferring everything to the draw node first before attempting to draw. `SegmentedGraph.TierColours` setter already correctly invalidates the draw node via `graphNeedsUpdate`, so no further intervention was required there. Closes #22326.