Windows: tab-completion works unreliable

[Harding-Stardust]

Steps to Reproduce

1. Create a directory
2. in that directory create a file named "lest.txt"
3. make that directory the current working dir in xonsh
4. type "copy le" and press tab.

Expected: The command line should read "copy lest.txt"
What happens: The command line reads "copy len"

Copy is in the aliases dict and there is no python object named copy:

"copy" in aliases
True
@(copy)
xonsh: For full traceback set: $XONSH_SHOW_TRACEBACK = True
NameError: name 'copy' is not defined. Did you forget to import 'copy'

Note: If you type "copy les" and press tab, then the autocomplete gets the correct file. "copy lest.txt"
Note2: if you type "cp le" and press tab, then the autocomplete gets the correct file. "copy lest.txt"

+------------------+---------------------------+
| xonsh            | 0.14.4                    |
| Python           | 3.12.1                    |
| PLY              | 3.11                      |
| have readline    | False                     |
| prompt toolkit   | 3.0.43                    |
| shell type       | prompt_toolkit            |
| history backend  | json                      |
| pygments         | 2.17.2                    |
| on posix         | False                     |
| on linux         | False                     |
| on darwin        | False                     |
| on windows       | True                      |
| on cygwin        | False                     |
| on msys2         | False                     |
| is superuser     | False                     |
| default encoding | utf-8                     |
| xonsh encoding   | utf-8                     |
| encoding errors  | surrogateescape           |
| xontrib 1        | coreutils                 |
| RC file 1        | C:\Users\<redacted>/.xonshrc |
+------------------+---------------------------+

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