@kleeneks @charliebrownau @Paultron I got a self compiled version, but it was on 2.41.
I installed 2.44 now, and now it works again.
The i2pd documentation (which had to be accessed using an archive because it's Cuckflared) has instructions on how to set up XMPP and IRC servers over I2P, which is very convenient.

Next question: how do I make browsers see .i2p links as websites instead of search queries?