I've noticed this in the logs for a backdrop recipe:
--2022-01-13 05:16:59-- https://raw.githubusercontent.com/lando/cli/main/plugins/lando-recipes/recipes/backdrop/mysql.cnf
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 185.199.110.133, 185.199.109.133, 185.199.111.133, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|185.199.110.133|:443... connected.
HTTP request sent, awaiting response... 404 Not Found
2022-01-13 05:17:00 ERROR 404: Not Found.
The instance still spins up fine, but thought I'd mention this anyway.