PJSIP bug ? limit number of channel active

Hi,
Try to put 7 extensions in a ring group, with ringall strategy.
call the ring group internaly (from another extension).
Not all the extension ring, but all extension are connected…
Why ?
idem with queue

FreePBX 13.0.192.16 offical distribution
Reports/Asterisk info/Current Asterisk Version: 13.14.0

Thanks a lot