First and foremost, I love the mod and I love what you are doing! I am by no means trying to criticize, I understand the mod is in beta and is prone to bugs, I'm just listing my finding, Bugs, or behaviors I think might be unintentional. Thanks for all the hard work. I really hope this project continues

Misc
- Setting tick speed to 1000 can crash the game easily (in aether)
- Bees spawn in the aether
- Blueberry bushes don't drop bush when broken by hand, with shears, or silk
- Blueberry bushes are immune to water/lava
- Gravetite tools don't effect gravity (WIP i assume)
- Gravetite ore flings up and down through the sky violently until eventually breaking (used to just soar into the sky and disappear, is this intentional?)
- Portals are not generated in the same shape as built (if build outside of a 2x3) and dont send you back to the original portal (creates a new 2x3 in the overworld)

Trees/wood
- Leaves are immune to fire
- Logs and wood are immune to fire
- Saplings don't drop from leaves
- Leaves don't decay (excluding sky root) (couldn't test crystal)
- Crystal saplings grow into nothing (appear to leave a ghost block in its place)
- Crystal saplings cause crash on growth with tickspeed set high (can still load into the world after reboot)
- Stripped logs cause decay (differs from vanilla)
- Fences don't link to each other (tested walls, they work fine)

Water
- All waterloggable blocks waterlogged without any problems! (excluding fence gates but that's the same as vanilla)
- Leaf piles are immune to water/lava
- Hangerplants are immune to water/lava
- Blueberry bushes are immune to water/lava
- Trees that grow with the random tick speed set higher spawn deformed almost as if the leaves are spawning before the logs, and then despawning because there are no logs(yet)

Quicksoil
- Works with blocks above quicksoil up to five snowlayers (carpet, slabs, rails, snow (up to five layers)
- Not on beds(4 layers) for some reason
- Boats on quicksoil can crash game
- Boats on quicksoil can cause the player to keep spinning after getting out (only happened to me once)
- [idea] Quicksoil boosting minecarts (might be a practical usage for quick soil)

Creative Tab (doesn't effect game, just an OCD thing)

- Holystone, Mossy Holystone & Holystone bricks are separated from its part block counterparts (slabs stairs, walls)
- hellfire walls appear before slabs and stairs,

i can do it it will just have to be later today

Portals are not generated in the same shape as built (if build outside of a 2x3) and dont send you back to the original portal (creates a new 2x3 in the overworld)

I think that might be a problem with @kyrptonaught's CustomPortalApi rather than with the Aether code. The rest should be easily fixable. Btw, next time try to make separate issue for every bug, it will make managing them a lot easier.

Actually, please can you seperate each bug into a seperate issue?

I can help with it dw, i'll get started seperating for you.

Crystal Saplings aren't implemented yet.

Going to close for now, i made issues for all the bugs you have found that are not reported.