Having the latest Fabric version of this mod installed prevents the G key on the keyboard from functioning, no matter what it is bound to.

Same here!

yea I use G as my drop key (don't judge) and it just doesn't work

but for some reason I can drop things out of the GUI but not the hotbar

Inside https://github.com/lilypuree/Decorative-Blocks/blob/1.19/Common/src/main/java/lilypuree/decorative_blocks/client/ClientSetup.java
I see the line
public static final KeyMapping switchItemState = new KeyMapping("key.decorative_blocks.switch_item_state", InputConstants.Type.KEYSYM, GLFW.GLFW_KEY_G, "key.categories.inventory");
apparently it is set to a constant variable, which is not configurable.

Installing https://www.curseforge.com/minecraft/mc-mods/dont-drop-it seems to temporarily fix this issue
but can this please be fixed? I want to remove dont drop it from our modpack - https://www.curseforge.com/minecraft/modpacks/darkrpg
but cant due to this issue stopping the G key from working