"/weather clear" command does not clear rain that started naturally

Steps to reproduce:

1) wait for rain to start naturally in a survival world

2) switch the game mode to creative

3) use the command "/weather clear"

 

Expected results:

The weather clears

Actual results:

The rain continues

 

Additional information:
If I use the command "/weather rain" even though it's already raining, then use "/weather clear", the weather changes as expected.

I did not test with other weather types.