On first launch of an AR app with Android the camera passthrough will render black. This also happens if an app is minimized and re-opened.
This will not repro if there is no candidate image assigned.
Also confirmed when packaging/installing an APK
Also confirmed in Shipping config.
Confirmed in 4.25 MAIN @ CL 11050671
No Repro on iOS (ipad A1701)
I noticed "LogRHI: Error: GetAndOrCreateGraphicsPipelineState RenderTarget check failed with: 185 !" in Device output log, but this error also occurs when app is behaving normally (after second launch)
Black screen also observed after minimizing and reopening app on phone.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-87102 in the post.