Overall features within multiple websites not working

Description of the issue:
I am unable to post comments on Github, login to my Jira account, watch mp4 files within Google Drive. The error seems to be stemming from a 422 (Unprocessable Entity) error, at least that’s what I have found for Github.

Exact URL of the website in question:
Github.com, https://www.atlassian.com/software/jira, drive.google.com

Did the issue present with default Shields settings? (yes/no)
yes.

Does the site function as expected when Shields are turned off?
It does not work as expected when shields are turned off.

Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no):
No

Does the site work as expected when using Chrome?
Yes

Brave version (check About Brave):
Version 0.68.142 Chromium: 77.0.3865.90 (Official Build) (64-bit)

@mwoloschek,
Thank you for reaching out. Can you try visiting any of the sites listed above while using a Private browsing session (or Guest window) and see if you get the same results? Additionally, can you tell me if you have any extensions installed in the browser?

Jira fix is incoming;

Most Brave employees use Github on regular/semi-regular basis, I’m not aware any issues with GH. The drive.google.com issue with mp4’s should be fixed in Brave-beta (just tested)