Bug Transparent pixels on UI Images are rendered as white on some iOS devices

Hello,
Today I upgrade my project from Unity 2019.4.24f1 to Unity 2019.4.34f1 and got a strange issue on some OS devices. Transparent pixels on UI Images are rendered as white.

1/ Bug screenshot:


2/ Normal screenshot:


For the overlay transparent background, I use this setup:


This issue occurs on some iOS devices: iPhone X, iPhone 6S Plus, iPhone 7 Plus, but does not occurs on XS Max, iPad Pro.
Note: this issue only happens with UI Images, all SpriteRenderer are rendered correctly.

Could you please help?
Thank you.

 

We have meet the same problem, today, when upgrade from 2019.4.28 to 2019.4.34!!

 

Confirmed. Rolling back Cloud Build to a previous version

 

I had a similar problem with white appearing on iOS devices, although it was all transparency for me. I got around it by changing the Color Space to DisplayP3.

 

I found the issues about this bug. But, it haven't been fixed in 2019.4.34 yet.

https://issuetracker.unity3d.com/is...ndered-with-different-colors-in-the-ios-build

You just switch to dark mode, then problem solved. No need to choose Display P3 in player setting. But, when switch light mode back, the problem still there.

 

Confirmed.

Unity 2019.4.34f1
---
iphone 11, iOS 14.8.1 - OK
iphone 7 Plus, iOS 15.1 - OK
iphone 12 Pro, iOS 15.0 - BUG

Unity 2019.4.31f1
---
all devices - OK

 

Similar issue:
Bug iPhone 6S + iPhone Xs:

Editor and Android:


EDIT:
Strike that, it was an issue with a submodule and cloudbuild