Realtime vs Baked Reflection Probe

I'm trying to use realtime reflection probe but I end up with a render quality issue on the metallic channel of the PBR shader. (Baked reflection probes are working just fine.)

Here's a checklist what I've tried so far:

• Texture quality (truecolor) Texture

• MIP (off/on) Texture Filtering

• Texture format (png/bmp 8/16bit)

• Texture sRGB bypass (on/off)

• Rendering path (forward/deferred)

• Colorspace (linear/gamma)

• Quality settings

• Editor mode/build mode

Can you guys help me out?