/weather command with duration 0 has the same weather for longer time

The bug

When running the command: /weather rain 0, it's expected to rain for 0 seconds and then become either clear or thunder. In other words, it's expected to change directly to another random weather. Currently it will continue to rain for a longer time.

Side note

1.12.2 displayed an error message when the duration was 0:

The number you have entered (0) is too small, it must be at least 1