Hi,
I've been working on CIMSymbols and discovered marker placement relativeTo:"SegmentMidpoint" is not working on 4.27 version. Given markerPlacement:
markerPlacement: {
type: "CIMMarkerPlacementOnLine",
relativeTo: "SegmentMidpoint"
}
I also tested it for 4.27+ versions (4.28 rc3 and current development next package), it is not working as well. It works for 4.26 version.
You can quickly try on this codepen link by changing version of library.