Viper writes wrong config after Set()

[vipyxc-byte]

Preflight Checklist

• I have searched the issue tracker for an issue that matches the one I want to file, without success.
• I am not looking for support or already pursued the available support channels without success.
• I have checked the troubleshooting guide for my problem, without success.

Viper Version

1.21.0

Go Version

1.23

Config Source

Manual set

Format

YAML, Other (specify below)

Repl.it link

#717

Code reproducing the issue

In Apollo configuration, I have the following settings:
security.app.key = 123
security.app.key.version = 3

Expected Behavior

normal

Actual Behavior

However, after setting values using viper.Set, part of the configuration gets lost.

Steps To Reproduce

No response

Additional Information

No response