Render Target mask for volumetric clouds resets when reloading level

So i had my paint clouds setup how i wanted them but i found out when i reloaded the project the following day the clouds were gone. The RT_CloudMask_01 resets back to blank by default for some reason. Meaning every time i open up my project i have to manually re-paint my clouds again. And that’s a pain since i paint them in a very specific way each time.

Does anyone know how i can stop this from happening ?

I have ben having the same issue. It gets difficult to visualise things like this.