So, it have been solved by
let config = ARWorldTrackingConfiguration()
config.environmentTexturing = .automatic
Thank you gchiste
daisukeMAJIMA
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Sorry. I just have not cancel the cancellable in ViewController.
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Calling `assetWriter.startWriting()` blocks all Threads for 3 seconds in debug (LLDB hang?)
I have same problem.
But it is just debugging ( when I press run on xcode ).
Once disconnect device and re-open app, it will be fixed.