Since updating to Android 9 a couple weeks ago, ARCore is no longer detecting any surfaces. It looks like it's picking up the scattered points, but no surfaces are being detected or generated.
Running "adb shell getprop ro.build.fingerprint" yields:
Sony/G8441/G8441:9/47.2.A.0.306/1344763102:user/release-keys
Prior to the update, running on Android 8 ARCore worked great.
Same here. Xperia xz Premium
Was working fine, surface detection was very good.
Since update to Android PIE it's now as you say it just won't find any surface!!
Also have tested on Samsung Tab S3 and the same is happening - but, that's on Android 8.0
None of our apps work that previously have.
This sounds like it's likely identical issue to #639. Lets concentrate the discussion there.
Duplicate of #639
For future readers, ARCore 1.6 has resolved all my tracking issues on the Xperia XZ1 Compact with Android 9.