Drawn disappears after input - BBB 3.0 Alpha 5

[FluffyUnicorn161]

Describe the bug
If you write/draw very quickly on the presentation with the pen, the content is displayed briefly (approx. 0.5 seconds) and then disappears.
This does not apply to all content and happens unpredictably.

To Reproduce
Steps to reproduce the behavior:

1. Start a BBB Session
2. Select the Pencil to draw on a presentation
3. draw several lines relatively quickly or write a few words quickly
4. See how individual strokes/entries disappear and sometimes reappear

Expected behavior
All entries should be retained

Actual behavior
If I draw quickly and the input is recognized, the lines should remain and not disappear afterwards

BBB version:

BigBlueButton Server 3.0 Alpha 5

Smartphone (please complete the following information):

• iPad
• IOS
• Safari & BBB-App