I am aware of that limit and it's fine. Those people are no longer in company. But i need kind of confirmation that if debug log says after all my system.debug that cpu used in that apex operation is 361 out of 10000. Then the problem is no in apex but all other validation rules, flows etc.

Added Apex and LWC

But i didn't receive any error, also i have edited post and added final version which is working

I have no idea what happend, i follow your advice by commenting whole function and html then console log in connected callback and it worked. Then i uncommented html and clearNotification function and... it works! Thank you :D

Still undefined :/ after loging in renderedCallbcack, also in previous test i have waited too.

sfdcfox, Thanks for info i will check network tab with user during screen share

Liam Gatt, production org -> files -> Libraries -> folder

Didn't help neither, same error :/