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The collapsed clip row dropped a keyframe's property group and animation id before handing it to a callback, so the same keyframe hashed to a different selection key than the expanded property lane did. Selecting a diamond in one view left it unselected in the other, and retime/delete on the collapsed row lost the animation id they use to pick between two animations that collide at one percentage. Diamonds now always carry their full identity, the collapsed shim just curries the element id, and Timeline reuses useTimelineKeyframeHandlers instead of its own inline copy of the same three handlers. Neighbour geometry moves into one marker record per diamond, which drops the index-lookup non-null assertions the connector pass needed.