Can't set domain name as alias

When I try to set domain name as my new aaPanel server's alias, it will auto remove the . in alias.

Current version: aaPanel LinuxStable 6.8.17

set demo.aapanel.com as alias

after save, it become demoaapanelcom

I can set domain name as alias in old version aaPanel

push

push

push

Hello, panel settings aliases do not support special symbols.