It’s quite normal for Mediation revenue not to show up as you’re earning the highest revenue for your inventory via other channels.
Ezoic gives you access to Ad Manager, which pushes up prices for your inventory by giving you access to a large range of networks that will often out-bid partners on the original setup. If you are not seeing any Mediation revenue, then your Ezoic Ad Partners are winning against your Mediation setup.
If you are still seeing revenue in AdSense, it could be because you do not have your Ezoic traffic set to 100%, so some visitors are still navigating to non-Ezoic versions of your site.