Parentheses not seen in SVG output

[ajeanmahoney]

This may be more of a documentation issue, but when lines are labeled with numbers in parentheses in the middle of a line, the parentheses are not carried over to the SVG output. The output is otherwise okay. This is seen with the following:

• Source file: https://raw.githubusercontent.com/ietf-wg-gnap/gnap-core-protocol/main/diagram/hash.md
• HTML output: https://www.ietf.org/archive/id/draft-ietf-gnap-core-protocol-20.html#figure-11

In the following, parentheses that are not used in the middle of a line are carried over the SVG output:

• Source file: https://raw.githubusercontent.com/ietf-wg-gnap/gnap-core-protocol/main/diagram/overall.md
• HTML output: https://www.ietf.org/archive/id/draft-ietf-gnap-core-protocol-20.html#figure-3

[martinthomson]

Yikes, I have no idea what might cause that. It's not particularly bad in those renderings, in that it is still clear, but it's definitely a head-scratcher. Perhaps it is due to the parentheses being treated as line segments in some way.