Caret position incorrect after paste with prefix and separator mask

[BobMakhlin]

🐞 bug report

Is this a regression?

No

Description

When pasting a decimal number into an input with mask="separator.2" and a prefix, the caret is placed before the last digit instead of at the end of the value. Without a prefix the problem does not occur.

Example: paste 123.45 into the input; prefix = $
Actual result: After pasting 123.45, the caret is placed before the last character: $123.4|5

🔬 Minimal Reproduction

https://stackblitz.com/edit/stackblitz-starters-o4dbhpbs?file=src%2Fmain.ts

🌍 Your Environment

Angular Version:

   _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 20.0.0
Node: 20.19.1
Package Manager: npm 10.8.2
OS: linux x64

Angular: 20.0.0
... animations, build, cli, common, compiler, compiler-cli, core
... forms, platform-browser, router

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.2000.0
@angular-devkit/core         20.0.0
@angular-devkit/schematics   20.0.0
@schematics/angular          20.0.0
rxjs                         7.8.2
typescript                   5.8.2
zone.js                      0.15.0
   

Ngx-mask version: 20.0.3