DuplicateSectionError: Section 'Sentinel.UNSET' already exists

When I run `beam deploy models.py:deepseek_r1` after pulling the vLLM examples, I keep getting this error:

```bash
> beam deploy models.py:deepseek_r1
=> Context 'Sentinel.UNSET' does not exist. Let's try setting it up.
Token: << redacted >>
DuplicateSectionError: Section 'Sentinel.UNSET' already exists
```