How to prevent changing the last character in the date range?

[lordenas]

Describe the bug
I want to make a mask for a date range. But when I delete the last character in the start date, it is replaced by a digit from the end date.

To Reproduce

CodeSandbox

Expected behavior
Expected, replacement with placeholderChar

Environment:

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]
• IMask version
• Framework/plugin version if used

Additional context
Add any other context about the problem here.