CI4 .env file connecting to multiple databases not working

I have four databases I wish to connect to, like so:

Code:

database.default.hostname = 127.0.0.1
database.default.username = something1
database.default.password = somepass1
database.default.database = somedatabase1
database.default.DBDriver = MySQLi

database.second.hostname = 127.0.0.1
database.second.username = something1
database.second.password = somepass1
database.second.database = somedatabase2
database.second.DBDriver = MySQLi

(and so on to database.fourth...)

When I had just one (default) it worked, when I added the other three, it stopped. Any clues?