[Bee] extra character are added after the bullets for the unnumbered list in the programmatic PDF

### Bug
Docling can handle numbered list well, but for the unnumbered list, extra character "∞" is added after the bullets.

### Steps to reproduce
1. docling convert with the testing file
2. export to markdown or html to check the results

### Docling version
2.42.2 - not working
latest docling - not working

[list-test.pdf](https://github.com/user-attachments/files/23404889/list-test.pdf)

### Python version
3.11

Start by reproducing the issue with `docling convert` and the provided list-test.pdf, then export the result to Markdown or HTML to inspect the unnumbered list. Trace the PDF list conversion path and verify that bullets are emitted without the extra "∞" character in both output formats.

Written by the indexing model from the issue text.