MP4 label is crushed on iOS

On the Moodle

1.Enter editing mode.

2.D&D any MP4 file on the course as media.It will be the activity 'Label'.

On the iOS Mobile App

3.Click the label activity, the video is shown inline.

4 Move to full screen, the apple video player is shown.

5.Close full screen.

6.Click the activity, the app will be crashed.

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Moodle 3.5.4+ (Build: 20190124)

iOS 12.1.3

Modle Mobile 3.6.0 NG... this crush is happened.

Moodle Mobile Classic OK...but I want to use new one, and don't want to use Moodle 3.6