Full disk encryption asking for a separate swap passphrase

[RastislavKish]

I have setup a system with Agama, turning on full disk encryption in the storage configuration. No other adjustments have been made, i.e. the installer was supposed to just wipe everything and install the OS on the disk.

The FDE technically works, but on each boot I'm asked to enter my decryption password twice, once for the data partition and afterwards also for the swap partition. This does not make a lot of sense, since it's the same passphrase and even the Agama installer does not distinguish these two.

Is there a way to setup the FDE in such a way that I would only need to enter the password once, and it would auto-decrypt everything?