Modpack version
1.72

Issue
There's currently no way to get Blue Slime (#8362/1). Besides the fact that #1407 exits, it's also odd that Blue Slime Saplings in the Sapling Infuser generate Green Slime Blocks, not blue ones. The other workaround via Compact Drawers (see https://www.reddit.com/r/feedthebeast/comments/bowu1o/enigmatica2expert_how_to_get_blue_slimes/enmixeo/?context=8&depth=9) also doesn't work anymore, so there's mo way to get Blue Slime in the game imho.

What about Blue Slime Trees?

There's also the option of automating blue slime blocks via a mob duplicator setup and auto-crafting the blue slime balls into blocks. You just need to find a blue slime first and have a supply of mob essence for the duplicator.

Seeing as this issue is a side effect of no blue slimes spawning, that's not possible.

I have found a blue sapling in the world(broke slimey leaves), but when planted it produces green slime blocks. Blue slime balls can be found in the world as well, but I have not seen an automated way of producing them.

Blue slime drops from blue slime leaves.

Yes can confirm, blue slime balls have a random chance to drop from blue slime leaves. They do seem to have a very low chance but definitely do drop.

From 5 blue slime trees vein-mined leaves using a crook, I got 19 blue slime saplings, 4 green slime balls & 2 blue slime balls.

Thanks for confirming :)