Path Trace DOF pass bug

Title: DOF in Path Tracing expands geometry instead of clean blur

Hi,

I’m rendering with Path Tracing and having an issue with Depth of Field.

In the DOF pass, all objects look expanded/thicker, as if they are being dilated instead of just blurred. This affects the whole scene (not alpha-related).

I want the result like in my second image (clean DOF), but instead I get this “expanded” look.

Has anyone experienced this? Is there a way to get clean DOF without geometry expansion?

Thanks!