Set value to zero after null

[Zettex]

Hello.
I have a problem displaying a zero value after null.
null is not displayed in the input, but if I change the value to 0, it also does not appear...
Maybe I'm doing something wrong?
Or is there a way to avoid this problem?

Example https://codepen.io/Zeroox/pen/mddyerR

This has been fixed with a workaround by setting the value to '0'... But I think this is not good.

[AlexandreBonneau]

This is indeed a weird behavior here, since setting the value as 0 should work as expected.

For info, I've updated your example with few more tests.