Since the lock down, I have been producing Sunday Services for our Church ( 7 since Easter). I do it via Facebook Livestream, so everything is done in real time.
I use a multi-view of 2 priests side by side (one a vMix caller)
So ,for the Hymns and Into/Outro music, I add the content into the project. I have tried wav, flac and mp3.
With Hymns, I add GT Title overlay, with dual camera feeds.
I have enabled the 'Automatically Restart with transition' butt I have found every now and then, the audio clip doesn't reset when merging, wiping etc from the left preview. The left preview shows the position at the beginning.
I noticed the issue with the original version I downloaded in April and also with the latest release 23.0.0.54
I also use video recordings of our congregation doing readings. So far, these have played correctly.
It was originally noticeable with the Intro and outro music, however it happened in a couple of the Hymns last weekend and I had to hit the reset position button.

I don't know if this could be causing it but as the production is similar each week I usually copy the folder with all the media. Replace the media with new files. Move the old folder.
I then Rename the vmix project file and then open it.
The UI then asks for the correct file for each input.