high battery usage in GrapheneOS

[yagilm]

Hello, I want to use Kvaesitso with GrapheneOS but unfortunately I see very high battery usage.
Specs:
GrepheneOS on Pixel 6
Android version: 16
Build number: 2026030201

Configuration:
Sys: Kvaesitso battery usage is restricted, meaning it is not allowed to run in background.
Kvaesitso configuration:

• Transparency: no transparency
• Search: Only enabled: Apps, Calculator, Unit converter.
  Permissions: Allowed only Contacts and accounts

All this started because the phone's battery was just going down faster and after further investigation I saw some weird battery usages. For example, there are (2-hour) timeframes that the usage is very high:
10:00-12:00: Usage 71%, Screen time: 4 mins, Background: 1hr 3 mins even though "Allow background usage" is disabled.