https://codeberg.org/mineclonia/mineclonia (https://content.luanti.org/packages/ryvnf/mineclonia/) is the closest you can get to real Minecraft, and it's actually quite feature-complete, more recent developments:

https://codeberg.org/mineclonia/mineclonia/pulls/3419 - Minecraft world gen (full reimplementation)

https://codeberg.org/mineclonia/mineclonia/pulls/3351 - raids

https://codeberg.org/mineclonia/mineclonia/pulls/2681 - much improved mob spawning

https://codeberg.org/mineclonia/mineclonia/pulls/2184 - a big mob rewrite

https://codeberg.org/mineclonia/mineclonia/pulls/2516 - client-side modding support, there's https://codeberg.org/halon/mcl_localplayer/ which makes physics and some other things way more Minecraft-like (elytras, proper eating, horses, etc), although currently it requires a Luanti fork since the upstream is not very interested in the changes.