This is part of the verbosity level. It's part of the core asterisk softmixer bridge logic. Previously we were using DAHDI bridge which did not create these messages.
You can reduce the level of verbosity to eliminate these messages.
Similar observation with our voter system in western Colorado. The update opened a firehose of voter receiver activity that closely tracks the Allmon3 display. The verbose settings I've tried have no effect. Not mission critical, will standby for possible improvement in a future update.
Resolved. Excessive screen activity ceased when we transitioned from a VirtualBox VM to a new dedicated mini PC, both running Debian 13 and ASL 3.8.3. Screen now displays routine softmix, Tx on and off, and client link status messages. All good and usable for observation of system elements transparent to users.