Problem solved!
Thanks to everyone who responded. The problem was that I was creating two separate MX records rather than just one. What I had to do was delete the second MX record but add the priority 20 data onto the first priority 10 MX record. I didn't understand that you could have two separate "parts" to the MX record. Google Domains enables this ability with the "+ Add more to this record" link.
Also, I had to leave the Host name field blank in both the MX and TXT records. GD then inserted my actual domain name into these fields when I saved the form.
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