Android Google playstore jitsi meet app calling issue on OnePlus phone having Android 9 version

I have downloaded jitsi playstore app on oneplus 5, 6T etc. Once video call is complete try cellular call to the oneplus user using another phone. Call won’t go through with message “user you are trying to call is busy” even though oneplus device is not occupied. This behaviour on oneplus will continue untill oneplus user calls places cellular call to someone else or restarts the phone.