swaybar shows multiple status lines at once

• Sway Version:

sway version 1.2-rc2 (Aug 23 2019, Arch Linux)

• Configuration File:

bar {
    status_command tail -f ~/sway-status.txt
}

When status command initially immediately outputs multiple lines, they all are shown on the swaybar. When after that the command outputs more lines, only the last line is shown.

Swaybar should always display only the last status line.

To reproduce, create a file ~/sway-status.txt with multiple short lines of text. Set status_command to output that file:

swaymsg bar bar-0 status_command "tail -f ~/sway-status.txt"