Using version 0.0.24 with the SkyFactory 4 modpack.

The sky_orchards mod's saplings (and possibly other items, but I haven't found other examples yet) get rendered incorrectly when a barrel is placed on a negative Z coordinate. The incorrect rendering looks like the item is overlapped with a mirror image of itself, causing Z-fighting to occur.

If the barrel is on a +X/-Z coordinate, the item is always rendered incorrectly, when the barrel is placed on a -X/-Z coordinate, the item is rendered incorrectly only if the player is on a positive X coordinate.

Screenshots:
https://i.imgur.com/EhKrw5s.png - Player on positive X and Z. All sapling items rendered incorrectly.
https://i.imgur.com/ScYL7A3.png - Player on negative X, positive Z. Saplings in barrels on +X/-Z coordinates rendered incorrectly, the rest are fine.

Regardless of the player's position, items are rendered correctly in barrels with a positive Z coordinate.

I can confirm this also happens with Rustic apple leaves and Vanilla acacia leaves. The issue does not happen for any vanilla saplings nor Rustic apple saplings.
Seems that Sky Orchards saplings are just very noticeable when they trigger this bug.

Edit: Confirmed on Rustic wildberry bushes. All partially see-through blocks are affected by this. I'll cheat in a few more blocks for testing.
Edit2: This is extremely obvious for blocks that use partial transparency in their textures! Stained glass looks awful.

Looks like this also affects leaf blocks, but the effect is much more subtle, looks like the "wrongly rendered" version also renders the back faces of the leaf blocks.

I don't think this is an issue with the crates. Those saplings also have issues when rendered in 3rd person last I checked. Considering no other modded block or fluid I've tested has had any issues like this, I'm inclined to believe this to be an issue on Sky Orchards' side.

Edit: If their leaves are using equally strange rendering methods then it wouldn't surprise me that they too have similar issues.