I was unable to find this myself, but entering these chunks made them invisible and caused a lot of strange chunk loading and unloading. Punching a block in some of the chunks made them load, but the main chunk(s) where the geode was located were impossible to enter (they kept pushing me back).
[media]Can confirm there's something very broken with this area, at least.
The snapshot you're on isn't 21w14a, it was 19w03a. Link to the bug in question: MC-140950