Animation sequence's ParticleNotify doesn't fire while playing it back in Sequencer editor

The ParticleNotify should always be triggered while playing in sequencer editor regardless whether the spawned particle is attached or not to it's bone/sockets

This stopped working since 4.15 version, that means in 4.15, no problem

• Download and unzip the project and open it
• Select the Sequencer actor “Walking” in World outline and double click on it to open Sequencer editor; Play back the sequence
• See, the character is walking and moving but without any particle effect get spawned
• Check the Animation Sequence(ThirdPersonWalk) it's playing, you can see it has a Particle notify on it. Play the animation in animation editor, see particle is triggered by the notify while playing the animation.
• Select the Particle Notify(P_Explosion), in it's details enable Attached option
• Play back in Sequencer editor, now the particle gets triggered