Issue with the airplay + bluetooth transmitter

my setup is following ropieee xl running on rpi4; bluetooth transmitter ;

When I enable bluetooth and add zone in roon; i can stream to it and speaker connected via bluetooth to rpi4 works okay; the issue is when i enable airplay via shairplay and i add the zone in roon, once streaming to shairplay zone sound that comes from the speaker connected via bluetooth is chopping. Any idea?