Steps to reproduce the issue

Install Persian language.
Add to the admin persian language folder this file
plg_system_skipto.txt

Note: some strings are not translated (Aside, Header, Form)

(Change .txt to .ini)

Make sure skipto system plugin is set to be used on site (or both).

Load site with Persian as default language. Click on Tab and then Enter

Expected result

the resulting css produced from the skipto.js produces

.skip-to [role="separator"] {
    font-weight: 700;
    text-align: left;
    color: #1a1a1a;
}

It should be aligned right in RTL
as the skipto css is loaded after any other css, it is impossible to correct this in template-rtl.css

Actual result

I guess it is an oversight by the vendor.