I have noticed that, when using Chiyu and Shian, rendering two ‘o’ phenomes next to each other like the image creates a pause in between notes.
Have you tried making the second note a “-” to continue the first note?
Or were you wanting each note to be pronounced individually?
Have you tried wo wo?
“wo wo” and “o -” are functional. I was more intending to report a problem than to find a workaround.