Problem entering 7b9 Chord with altered bass

I am trying to enter chord symbols using the pop over and typing a chord F#7b9/B. All that appears is just /B. If I place a simple chord say “C” on the first beat of a bar the F#7b9/B chord can be placed on the 3rd beat and it displays correctly. I have placed a cut down version of the flow and a screen recording on my DropBox site but I can’t seem to be able to place a link. This is my first project. Thank you for any assistance.

Welcome to the forum.

Is the previous chord also also some sort of F#7b9? If so, see Engraving Options > Chord Symbols > Altered Bass Notes.

Amazing thank you. Mind boggling learning this programme.