[Bug] Spleeter Training is not working

- [+] I didn't find a similar issue already open.
- [+] I read the documentation (README AND Wiki)
- [+] I have installed FFMpeg
- [+] My problem is related to Spleeter only, not a derivative product (such as Webapplication, or GUI provided by others)

## Description

Spleeter Training stucks but spleeter separating works.

## Step to reproduce

Installed FFmpeg using PATH variable
Installed Spleeter using python3.9 pip
Downloaded MuseDB uncompressed version
Set 22Khz (F=2048) in the config files.
Downloaded CSV files from this respository and put them in their proper places.
Extracted MuseDB to a folder named configs containing the two CSVs and musedb.config file
Started the action using the spleeter train command

## Output

Continued to load the musedb like a loop until It stucks at:
INFO:spleeter:Audio data loaded successfully

## Environment

| | |
| ----------------- | ------------------------------- |
| OS | Windows 11 |
| Installation type | PIP / FFmpeg (PATH) |
| RAM available | 12GB |
| Hardware spec | Intel Core i5 gen 2 |

## Additional context

Start by reproducing the `spleeter train` command with the reported MuseDB configuration on Windows 11 and Python 3.9. Inspect the logs around “Audio data loaded successfully” and compare the training path with the reported working separation command; done means training progresses past that point or the blocking condition is documented.

Written by the indexing model from the issue text.