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Let's take this to the tertiary level of guessing.
The oil comes from the engine into the plate through a hole in front of the thermostat spring which is open to the port on the green dot side. So, that port is always pressurized which means the line going to cooler is also pressurized as is the return line to the sandwich.
So, when the thermostat opens, it lets oil flow back into the sandwich plate from the cooler through the return line, which is the opposite of the diagram.
Can you explain it another way? I'm happy to be wrong.
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