PIPEWIRE_LATENCY does not set JACK applications buffer size
I created a copy of the pipewire.conf file in ~/.config/pipewire with the following configuration:
#default.clock.rate = 48000
#default.clock.quantum = 4096
#default.clock.min-quantum = 32
#default.clock.max-quantum = 8192
#default.video.width = 640
#default.video.height = 480
#default.video.rate.num = 25
#default.video.rate.denom = 1
#PIPEWIRE_LATENCY=128/48000 Carla
#PIPEWIRE_LATENCY=256/48000 Zrythm
#PIPEWIRE_LATENCY=4096/48000 Ardour
After editing, I tested and the following results are both before and after restarting the machine: