I run a server and installed this mod server side. Some users installed it client side some did not. For those without the mod facing a placed wind chime, the chunk and all chunks behind it were voids, like an unloaded chunk. Those players could not enter or interact with the chunk. Load the mod client side and everything is fine, remove the mod from the server side and all players are fine.

Server Version: 1.18.2 Fabric
Mod version 1.2.0

That's fascinating what Minecraft does when it encounters a block that isn't on its registry, it just goes completely belly up. Sadly there's nothing I can do other than asking you to have your players to install Windchimes.

The whole point of Windchimes is to have it be immersive and some of it is to just once in a while glance at it and see it wailing on the wind. I could potentially use Polymer and try to add compatibility, but this mod wasn't designed around vanilla clients, and it wouldn't be the same without the mod clientside.

With Polymer, I could also make the chimes swing in the wind too like they do with the mod installed, but this is not a trivial task, I'd have to like spend an entire week nonstop, because I really don't know GLSL or the vanilla shader architecture.

I'll close the issue because it's out of scope, and a the solution is nontrivial. I may revisit this if I want to deal with vanilla shaders, but it's not a guarantee. Hope this helps!