I was flying around in my world when I sprint flew backwards. The bug worked by sprint flying then turn around (sometimes not necessary) then pressing s in quick succession, Same thing with sprint. You can even do it is survival (sprinting).
MCPE-23670
You can sprint fly or sprint backwards
Resolved
Duplicate
0
Tamara Strom
(Unassigned)
Unconfirmed
Windows
1.1.4.51
Retrieved
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-23502
It has been linked to this report. If you have additional information, please add it to that report.
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