Not sure of the build of the original poster; I am at 25.
Steps to reproduce:
1. Export sequence with a caption track.
2. Set for sidecar/srt (burn in does not create this problem; did not test non-srt sidecars)
3. Export directly from PR (or according to poster, also via AME).
Result: Upon return from export (and you can see this behind the export progress window), the Caption Track has been disabled (eyeball off).
Expected: Caption Track should remain enabled.
Application: Premiere Pro (Beta) v184.108.40.206
OS: Windows v10.0.19041, RAM: 23.99 GB, CPUs (logical): 8
Have something to add?