BUG: lower third with in/out transition creates glitch in audio signal

huge issue on a 8 hour webinar today!
especially after a few hours, each time I was showing a lowerthird with transition I could hear some glitch in the audio signal.
subtle, but definitely noticeable.
I have recordings to share with the dev team if needed.

macOS 10.15.7 on a macbook pro 2018
mimolive 5.9.1
(turboboost off, gpu not automatic, and the usual things all checked out…)