Ubuntu browser exit reset BAT rewards

Steps to Reproduce (add as many as necessary):
1.Launch Brave on Ubuntu
2. Wait for rewards accumulated.
3. Accidental close of browser or relaunch of browser activating some option settings leads to lost recently accumulated brave reward.

e.g Brave rewards is 2 and exit browser reset to some preset value of 1.78. then let to accumulate nearly 2 and accidentally closed browser reset the value to 1.78. happens many time and lost nearly 1BAT.

Expected Result:
Accumulated BAT rewards should stay

Reproduces how often:
Always

Brave Version(See the About Brave page in the main menu):
Version 1.26.74 Chromium: 91.0.4472.124 (Official Build) (64-bit)

Reproducible on current live release (yes/no):
Yes