Describe the bug
During the upgrade from Nacos 2.0 to 3.0, if configurations with the same Group and DataId are modified simultaneously in both the Public namespace and the empty namespace, there is a risk that the changes may be lost.

Expected behavior
A clear and concise description of what you expected to happen.

Actually behavior
A clear and concise description of what you actually to happen.

How to Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See errors

Desktop (please complete the following information):

• OS: [e.g. Centos]
• Version [e.g. nacos-server 1.3.1, nacos-client 1.3.1]
• Module [e.g. naming/config]
• SDK [e.g. original, spring-cloud-alibaba-nacos, dubbo]

Additional context
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