If you try to place vines in a corner occupying the same space, you can’t. This is different from Java as you can place vines within the same space. You can also place them on the ceiling in Java but can’t in Bedrock. This is unlike the glow lichen, as you can place it in the same space on different faces with ease and on the ceiling. I know these are separate blocks, but I feel the placing capability should basically be the same (except glow lichens can’t hang).