Minecraft Version: 1.21
Mod Version: 1.3.1
Mod Loader: Fabric

Description:
Game crashes when placing Deeper and Darker boats in ether from Eternal Starlight (vanilla boats just break).
(Eternal Starlight version used: 0.1.5 Fabric)

To Reproduce:
Steps to reproduce the behavior:

1. Go to an ether lake in the Starlight dimension or make one using ether buckets in any dimension.
2. Use boat from Deeper and Darker mod on ether.

I tried both the newest version (0.1.18) and 0.1.5 and neither crashed. I tried with all four variants (echo boat, bloom boat, echo boat with chest, and bloom boat with chest). Maybe it's already fixed in 1.3.2.1, could you try that version?