Annotations with float coordinates don't show

[stephenwf]

Example annotation:

{
  "@id": "https://ra-exhibition-pmc.dlc.services/pmc/annotationlist/c9495f6c815358306e84dd121bc16ae7/6",
  "@type": "oa:Annotation",
  "motivation": "oa:linking",
  "on": "https://presley-pmc.dlc.services/iiif/raa/Vol10/canvas/c3#xywh=887.0800000000002,446.95288888888933,1377.0555555555554,165.24666666666656",
  "resource": {
    "@id": "https://ra-exhibition-pmc.dlc.services/index/exhibitors/B#Francesco%20Bartolozzi+%28Engraver%29",
    "label": "Bartolozzi, Francesco (Engraver) Exhib. 1769-1799"
  }
}