If you resize the composer, all passes in the pass chain are resized as well. BokehPass.setSize() is called as well which resizes the internal render target. I think the issue is that BokehPass has an aspect uniform which relies on the aspect ratio of the camera. If you resize the window, camera.aspect is usually updated with a new value. However, the uniform isn’t automatically updated yet. I’ll fix this with a PR: BokehPass: Correctly set `aspect` in `setSize()`. by Mugen87 · Pull Request #27063 · mrdoob/three.js · GitHub
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