Emptying the input when removing the last character

[davidsl4]

Hi, I've encountered an issue (or a feature?).

I am trying to implement an input that formats phone numbers, we have a few formats, so I used a dynamic mask with a few pattern masks and a dispatch function to select the best pattern.

All works fine; however, when I try to delete a fixed character of the mask, it clears the whole input value. See this video for reference. In the first example, the fixed part is 058 32 and in the second example is 050.