Unlocking part of Page Title meta setting doesn't work

[grndctrl]

Description

Updating SEO setting "Page Title" doesn't work. Since I have changed the sitename I want to remove/unlock it from every page meta. But removing or unlocking the token doesn't seem to work.

Steps to reproduce

1. Have a page with page title [unlocked]{title} [locked] - {{siteName}}

2. go to SEO Settings, unlock {{siteName}}

3. go back to page, unable to change the part of {{siteName}}

Additional info

• Craft version: Craft Solo 3.6.12
• SEO version: 3.7.1
• PHP version: 7.4.16
• Database driver & version: MySQL 5.5.5
• Other Plugins: Redactor, Super Table

[grndctrl]

Manually overriding it in the seo-[hash].yaml file in my project config seems to have solved it for me, but I think it should still work from within the CMS too, right?