Good news! It turns out that the new code to fix the mail merge fields in Three Rings doesn’t introduce an inconsistency with established behaviour. It was important to check, but it turns out all is well.
I touched bases with a fellow volunteer on Slack. Three Rings volunteers primarily communicate via Slack: it helps us to work asynchronously, which supports the fact that our volunteers all have different schedules and preferences. Some might do a couple of evenings a week, others might do the odd weekend, others still might do an occasional intense solid week of volunteering with us and then nothing for months! A communication model that works both synchronously and asynchronously is really important to make that volunteering model work, and Slack fits the bill.
We get together in person sometimes, and we meet on Zoom from time to time too, but Slack is king of communication at Three Rings