liudvikas65,
Thanks for clarifying that for us. To help with troubleshooting issues with True Tone not working as expected further, have you tried restarting your iPhone since the issue started? If not, give that a try with the steps below: Restart your iPhone - Apple Support
How to restart your iPhone X, 11, 12, or 13
1. Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.
While restarting may seem like a simple step, it can often help with resolving some unexpected issues like this. If still having issues after restarting your iPhone, or if you've already tried restarting the device, we'd also recommend ensuring that your iPhone is updated to the latest iOS version. This can help resolving issues that you may be experiencing in previous iOS versions.
For help with checking for and preforming updates on your iPhone, check out this next link here: Update your iPhone or iPad - Apple Support
Update your iPhone or iPad wirelessly
1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. Choose the software update that you want to install. You can choose to stay on iOS or iPadOS 15 and still get important security updates. Or you can choose the option to upgrade to iOS or iPadOS 16.
5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
Keep us updated on the results after going through the steps above, and we'll continue from there.
Cheers!