We had the exact same problem.
We also saw that the tier never got a .NET icon when registering. Node reported 0% all the time and no transactions.
After a support call with Appd we learned there is a bug in agent for .NET core Linux, in version 4.5.13.
The resolution was to upgrade the agent to 4.5.18 and DELETE the TIER all together from the Controller and let it re-register.
After that everything works as expected.
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