Creating a PR from a filled out comment body fails the template finder

[wooorm]

Initial checklist

• I read the support docs
• I read the contributing guide
• I agree to follow the code of conduct
• I searched issues and couldn’t find anything (or linked relevant results below)

Affected packages and versions: TODO

Steps to reproduce

Link to code example: syntax-tree/hast-util-parse-selector#6

Expected behavior

Should infer template

Actual behavior

bb looks at the first mdast node in a issue/pr, which should be a comment, and infers the used template from that.
When opening a PR, other text is placed in front by GH, which messed up detection