1
As Mike stated in the comments
Even when you have a cluster of one you will need to extract the real feature from the cluster
this means the return feature; will need to instead be return feature.get('features')[0];
so the code became
Omap.on('click', function (evt){
var feature = Omap.forEachFeatureAtPixel(evt.pixel,
function (feature,layer) {
...
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