Polyscope.log not updating

I’m connected to a UR5 robot via SFTP using Filezilla.
The polyscope.log only gets updated on bootup and stops updating even if I refresh the directory.

I tried deleting the existing log file then restarting the robot.
It recreates the log file but then stops updating at around the same line, the modbus_set line.
Is there any log setting I need to modify?