[Resolved] Language switcher doesn't display native language after switching to Twenty Twenty-One and disablin...

Background of the issue:
I am trying to have the language switcher show the language name in its native language.

For example, "English" will show as "English" and "Punjabi" will show as "ਪੰਜਾਬੀ"

However, at present they only show in English, no matter what settings I use.

I have:

-Increased memory limit

-Deleted the current langauge switcher and re-added it.

-Translated the only string I could find that says "Punjabi" in English.

-Checked different boxes on the langauge switcher settings to see if it would change anything (it does not).

-Switched to Twenty Twenty-One theme and disabled all plugins except WPML plugins.

-Tried adding a langauge switcher in the footer and in the menu, to see if those work (they do not)

-Cleared website cache

-Viewed the website in Incognito mode

None of the troubleshooting steps above seem to work.

Please note that in order to continue working on other parts of the site, I will need to switch it back to our original theme, and not continue using Twenty Twenty-One until it is time to troubleshoot again. I have attached screenshots for reference, however.

Symptoms:
The language switcher menu items are only displayed in English instead of their native languages.

Questions:
Why does the language switcher not display languages in their native form?
What additional steps can I take to resolve this issue?