Im having a similar problem where I have setup a master sequence with multiple cuts and cameras. Basically everything in the cinematic tutorial videos using the infinity blade assets.
Everything seems to play through fine in realtime when I play in the sequencer/cinematic viewport; but when I render to video the animations on the skeletal meshes often freeze and pop back to spawn pose.
Ive tried to look into some of the solutions for the similar problem here but it doesnt work.
Has anyone had this issue or have a solution? Thoughts?
Using a pretty beefy machine and 4.18.2