[Major] Cinematic Sequence either not fully complete or not finish replicating correctly when playing in reverse

Summary

I noticed that a linear 0 to 1 animation did not fully complete when the cinematic sequence was executed on a player basis in reverse (1 to 0). The value often kept ending at some 0.0xxxx value.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Devices

Steps to Reproduce

  • Place a cinematic sequence device
  • Create an a simple animation (for example an MPC value going linearly up from 0 to 1)
  • Play the animation in reverse on a targer player
  • Observe the result (for example through a debug scalar material function for the same MPC value)

Expected Result

The animation should finish at value 0.0

Observed Result

The animation often does not reach the expected state (0.0) and ends up being some random 0.0xxx value.

Platform(s)

UEFN (v37.00 and v37.10)