There is a more minor bug that can be reproduced the following way:
In 'Preferences' -> 'Notifications' -> 'Play tick tock sound during' check 'Pomodoro' and uncheck 'Break'.
Start a pomodoro
Start a short break (without stopping the pomodoro)
The ticking won't stop.
Alternatively if 'Pomodoro' is unchecked and 'Break' is checked then the same happens when a pomodoro is started during a short break.
There is a more minor bug that can be reproduced the following way:
The ticking won't stop. Alternatively if 'Pomodoro' is unchecked and 'Break' is checked then the same happens when a pomodoro is started during a short break.