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Description of the issue:
It appears if you switch between light and dark mode within Brave, tabs will be refreshed accordingly. However, if you have display set to “Auto” in Brave and switch between light & dark mode under iOS setting , tabs will not be refreshed and you need to manually relaunch the app.
This is quiet annoying if you have dark set to auto under iOS setting, which is my case. 
How can this issue be reproduced?*
- Configure Display & Brightness to auto on Brave.
- Switch dark mode under system setting in iOS
Expected result:
Tabs are either locked to light or dark mode in brave, you have to manually to close and relaunch the app.
Brave Version( check About Brave):
1.12 (19.09.13.06)
Mobile Device details
iOS 13 iPhone XsMax
Additional Information:
Can’t add attachment as new user so i uploaded screen recording and screenshot to WeTransfer