SQL Server 2019 (RTM) – 15.0.2000.5 period has expired after upgrade to CU 8

Hi i have MS SQL with version

Microsoft SQL Server 2019 (RTM) – 15.0.2000.5 (X64) Sep 24 2019 13:48:23 Copyright (C) 2019 Microsoft Corporation Enterprise Evaluation Edition (64-bit) on Windows Server 2019 Standard 10.0 (Build 17763: ) (Hypervisor)

When i use this version and performed Log shipping, there is an error and i check on microsoft doc, the error because bugs in sql and i need to upgrade the sql server with Cumulative Update that i download in here https://www.catalog.update.microsoft.com/Search.aspx?q=sql%20server%202019

i use the latest CU. at first everything was fine until about 60 days i get error that says ‘SQL SERVER Evaluation period has expired’. And this happened in 3 servers (Production, DR, UAT). after several weeks after upgrade to CU8, got period has expired.

is it normal? because when doing installation, what i do is next and next