升级到新的代码后,在模拟器上DateFormatterTransform转Date失败,在真机上没问题

最近升级到最新的代码和xcode后,postingDate在模拟器上为nil,在真机上是ok的,以前在模拟器上也是ok的
mapper <<< self.postingDate <-- DateFormatterTransform(dateFormatter: format)

Start at DateFormatterTransform and the mapper assignment shown in the report, then reproduce the postingDate conversion on both simulator and device using the affected Xcode version and date format. Done means postingDate is populated consistently on the simulator without regressing the working device behavior.

Written by the indexing model from the issue text.