This ghost bug is a bug that can be activated by wearing any type of ghost armor and when you roll to activate the ghost form, open your inventory and swap to any type of armor or remove your armor and exit out the inventory and the roll will finish. But it activates the ghost bug, which mean you stay in this ghost form 24/7 (not 100% certain). Your weapon and bow will remain invisible. For more information I recommend to watch this video which is where I found the ghost bug (This video also says that this is OP).

Video Link: THE GHOST BUG - Permanent Ghost Form Glitch in Minecraft Dungeons - YouTube