Android 11 stable installed but....

Please tell us some basic information before asking for help:
- Model Name: Zenfone 6
- Firmware Version: Android 11
- Rooted or not: no
- Frequency of Occurrence:
- APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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I'm glad I installed Android 11 but I have a small bubble that often appears at the bottom of the screen where it says null.
It ils this error
It looks like a flash or a pop up notification which was supported earlier but not by the current A11. It could perhaps be something similar to carrier flash messages which aren't being allowed by the system to invade anymore.
It is a Toast Message from some of your installed app.
Install some app which can intercept toast messages like this
https://android.gadgethacks.com/how-to/find-out-which-app-is-displaying-toast-notifications-your-android-phone-0384157/
It seems to be a known bug of Firefox Lockwise on A11 (not just on the Z6).
An updated (and signed) version of FL can be manually downloaded from the following link:
https://github.com/mozilla-lockwise/lockwise-android/releases/tag/release-v4.0.3
Thank you so much, now it's stopped. 😀