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This issue with the "._.git" file in the untracked working tree can be resolved by following these steps:

Firstly, navigate to the directory containing the problematic "._.git" file using the command line.
Then, execute the following command to delete the "._.git" file:
```
rm -f ._git
```
This command will force delete the file, even if it is locked or in use.
Finally, run the command git status to ensure that the "._.git" file is no longer present and that the working tree is clean.

If the issue persists, then it may be helpful to check if any other programs or processes are interfering with the git repository, or to use a program like GitKraken to visually identify and manage any unresolved conflicts in the repository.