🐞 bug report

Description

"Dynamic valid mask" is not working with "repeat mask":

<!-- is not working -->
<input type="text" mask="0{10}||0{12}"> 

<!-- is working -->
<input type="text" mask="0000000000||000000000000">

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-ivy-x5em9s

🌍 Your Environment

Angular Version:

Angular CLI: 11.2.6
Node: 12.18.3
OS: darwin x64

Angular: 11.2.7
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes

Package                         Version
---------------------------------------------------------
@angular-devkit/architect       0.1102.6
@angular-devkit/build-angular   0.1102.6
@angular-devkit/core            11.2.6
@angular-devkit/schematics      11.2.6
@angular/cdk                    11.2.13
@angular/cli                    11.2.6
@angular/material               11.2.13
@schematics/angular             11.2.6
@schematics/update              0.1102.6
rxjs                            6.6.7
typescript                      4.0.7