Receiving email replies in Gmail but not in Mailspring!

Problem

I have my work email imported into Gmail (my primary Gmail email is a...a@gmail.com, my work email is t...a@tryuptick.com). I recently installed Mailspring and similarly linked the account. I receive emails that are directly sent to my email, but emails I receive in response to my own emails appear in Gmail and not in Mailspring.

Context

Here is the original source of a recent message that got picked up by Superhuman via Gmail, but not by Mailspring.

Email Provider

Mailspring / Gmail+Superhuman

Setup

OS and Version: macOS 11.4
Installation Method: installer
Mailspring Version: 1.10.5