Adding animations with a negative play rate (playing backwards) or modifying existing animations in a montage to have a negative play rate causes the timeline in the montage to "squish" and is no longer functional.

Another separate, but related AnswerHub report:

Steps to Reproduce

Open a project that contains a montage and supporting anim sequences.
In the anim sequence change the play rate to -1.0
Open a montage that contains the anim sequence
Observe the anim sequence in the montage timeline.
The sequence will appear "squished"

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Cannot Reproduce
Affects Versions4.6.14.7
Target Fix4.9
CreatedJan 14, 2015
ResolvedJun 29, 2015
UpdatedMay 19, 2020