Negative Storage with volumeTotalCapacity on watchOS 7.2 Watch Series 3?

If I try the following code on my Watch Series 3 with WatchOS 7.2 beta 18S5555c, I get a negative value of about 864MB, instead of the approximate 8GB it should report:

Code Block
try print("total=\(URL(fileURLWithPath: NSHomeDirectory()).resourceValues(forKeys: [.volumeTotalCapacityKey]).volumeTotalCapacity ?? 42))")
total=Optional(-864661504))



The same happens with url "/".

What gives? What am I doing wrong?

iOS and macOS behaves correctly.
Negative Storage with volumeTotalCapacity on watchOS 7.2 Watch Series 3?
 
 
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