Cant donate with PayPal when Facebook Container installed

[Jaberwwocky]

Actual behavior

I use PayPal to donate to a certain site and Facebook Container is enabled, I click on PayPal donate button and PayPal redirects me to a account summary or login page.

Expected behavior

After clicking PayPal donate button, I should be redirected to a PayPal donation page, with amount visible and Donate button.

Steps to reproduce

1. This page is for members only, so I'm not sure how to reproduce, don't know if it is the same with other PayPal payment

Notes

When disabled, I can use PayPal donations normally, also Chrome works fine, all with the same page.
And I have no idea what Facebook has to do with PayPal anyway

I'm using windows 10 Home, updated, Firefox 82.0.3, and FB Container 2.1.2

Thank you