They all do this. Lookup a cam plate replacement for it. Aftermarket ones come with a nice o ring isnted of the bullshit rtv that subaru installed.
Here ya go.
https://raceseng.com/products/cam-pl...r-s-subaru-brz
Money well spent. You will have to rtv that plate like 10 times to get to stop leaking... Until a massive temp shift causes it to shrink and it will leak again.