The behaviour without the -T switch has indeed changed although the
problem remains as described. At one point in loading projects Bitwig
will not be able to enable audio. Here's the change in behaviour.
These few lines from jackd were taken when Bitwig cannot enable audio.
It loops endlessly with the last two lines during which time the
audio is not enabled in the newly loaded Bitwig project. The
loop frequency is slow, perhaps each 5 seconds.
Curiously, after closing Bitwig jackd will continue looping with
the last line below.