Planar Reflection on Translucent Glass Material

Hello everyone, I’m sorry to bother someone here but I’ve followed every thread I’ve found online and I cannot get this thing to work.

I want to make a glass material for a window, and I want the glass to reflect the inside of the room and the character of the player.
At first I did just a Translucent material with reflection, but I could only see the sky reflected weirdly on it. So I found I had to place a PlanarReflection actor in the scene, correspondind to the position, size and orientation of my window. I turned on on the project settings the option “Support global clip plane for planar reflections”.

At first it has worked, but after reopening the project the day after, it came back to reflecting the sky.

I tried everything, modifing every variable to see if any of them was the one that make the reflection fail, but nothing happened.

Here is the simplest I could make the material, but it still doesn’t work.

I made some glass pane of the window with a Opaque material to see if it was a problem of the planar reflection actor, but the opaques one works prerfectly.
As you can see the two “mirror” panes works perfectly while the two glass ones are reflecting weirdly the sky.

Thank you to everyone that will help me!