Delete unused material clear the SKY

[masterzone]

Hello to all, I found a strange behaviour on latest Corona render 9.
Look at the video attached at the topic...if you hit "delete unused material" the SKY preview is gone :)

[Beanzvision]

Hi, thanks for the heads up. I have reported this and can also confirm it happening in RC1.
(Internal ID=1138300402)

[masterzone]

I'm happy to help developer to flush away bugs or issue...

[Beanzvision]

And we certainly appreciate it! :)