Small suggestions for the update to the latest version

Preserving (locking) item frames with resin clumps:
Relatively simple feature which would give resin more utility, right clicking an item frame with a resin clump will prevent the item inside from rotating or being removed. Would hopefully work with both regular item frames and invisible ones.

It can utilize the locked item frame state already available to commands, much like the invisible item frame. Can be undone by right clicking with shears

Making use of waxed copper bars/chains blockstates:
The copper age update adds both regular and waxed copper bars and chains. This means that much like with the waxed copper stairs/slabs, theres 4 potential custom bars and 4 potential custom chains that can be made.

I think it’d be really nice to get wrought iron bars, matching the color of chains, anvils, hoppers. They could be crafted with 5 iron nuggets and 1 coal/charcoal.

Chainlink fences could also be another cool one, i think builders would get a lot of use out of both of these. It could be crafted with 2 chains and 2 iron nuggets.

Since copper bars share the same hitbox size and connective properties as glass panes, it could be possible to retexture them into a framed glass pane! In one of the newer updates, mojang added support for adding translucent textures to things.

There of course wouldn’t be enough blockstates for stained glass versions, but even just a regular framed glass pane would be a huge difference to building. It could be crafted with 2 glass panes and 2 iron nuggets.

Adding shelves for the custom woods:
Each shelf in vanilla has a state only accessible by command (items being on the bottom of the shelf instead of the middle), meaning custom ones could be implemented to match the custom woods!