Long black screen before splash screen after building to UCB

Hello,

When I build my AR app for Android via UCB I get a very long (15-30 second) black screen before the initial splash screen appears. If I build via the editor this does not occur. Also no issues when I build to iOS via UCB. (Although, my previous post still goes unanswered - re: how to have an Android splash screen AND an iOS storyboard enabled at the same time so you can do “Build all” in UCB).

Unity 2019.3.12f1
AR foundation 2.1.8
Addressables 1.7.5

I am having the exact same problem on an iPhone 6S. Works fast on an iPhone 12 and 12 Pro Max - but a long delay on the 6S.

Is there anything in cloud build that would make this happen? Possibly linked to addressables? I’ve got other games using cloud that seem to be fine, but don’t use addressables.

Unity 2019.3.14f1
Addressables 1.16.10

Thanks