iPad Battery Limit 80% make usb connection drop when charge reach at 80%

My iPad Air M2 just enable Battery Limit function. I use iPad for DJ with Reloop Flux audio interface and plug usb-c charger to Reloop Flux USB-PD port. when plug iPad to my dj setup and iPad battery charge reach to 80%, USB communication between iPad and audio interface is disconnect and reconnect again but if i disable battery limit it don’t happen. This is normal for iOS,iPad battery limit feature and PD protocol?