Video showing the problem, when using breakpoints to cause a race condition.
bug558655_reproduction_steps.mp4 (video/mp4), 2.90 MB, created by Simeon Andreev CLA on 2019-12-31 04:38:28 EST
(hide)
 
Creator: Simeon Andreev CLA
Created: 2019-12-31 04:38:28 EST
Size: 2.90 MB

Attachment is not viewable in your browser because its MIME type (video/mp4) is not one that your browser is able to display.

Download the attachment.

Actions: View
Attachments on bug 558655: 281359