This issue is caused by a problem within Openshift itself. It's document here:
I had to force a refresh of the Operatorhub to get the correct listings. We might want to add a release note.
I was still presented only with the `alpha` channel when creating a new subscription. This can be resolved by running
Wait until operatorhub lists no sources/only custom sources and run:
This should force the reload of all catalogs and the fuse-product.7.7.x channel will show up.