Dark Mode not Working on iPhone 8+

I’m running IOS 13.3 on an iPhone 8+ Under Appearance, I set it to Dark. However, all pages still display with a white background. I am not running in private mode. It appears the only browser that displays dark mode, on my phone, is Firefox. Any suggestions?
– KS

Expected result:

Brave Version( check About Brave):

Mobile Device details

Additional Information:

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