The fluid mesh has a boundary layer and it is much finer than the structural mesh:
I would try to reproduce one of these 2 examples first. Create your own mesh and see if you can reproduce the results with a coarse fluid mesh. Then, refine the mesh, add a boundary layer and see what you get.
At last, I would also try without constraints on the rigid plate and see what you get. But, I think a finer mesh will help prevent the leakage.
Let me know how it goes.
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