Yesterday I got a hole-in One on Hilversumsche, but it does not show up in my stats for some reason.
The Stats only count stroke play ranked rounds, so anything done in CTTH will not appear in the stats.
You will find hole-in-one for CTTH events in your awards
Awards > Master your game > Holes-in-one - CTTH courses where you now have 3
Thank you very much for clarifying that for me.