It appears they have changed how Image works internally and my ugly hack of reading directly from its internal buffer has exploded 
Problem was an array indexing miscalculation in my C++ code (many such cases). It failed silently in the old build, but triggered a segmentation fault in the new version.
I'm trying to implement the CDLOD heightmap algorithm in a GDExtension. I'm pretty close. I need to implement the distance function (basically just log₂(distance)) and frustum culling (Camera3D provides methods which make this fairly trivial, and I already know the AABB of any arbitrary tile. The code which was failing was the bit that runs on leaf tiles to iterate the actually pixel data and find the Z-min/max. From there the min/max values just accumulate back upwards as the initialization function ascends out of the tree).
It's a pretty cool system (especially for it's relative simplicity). I'm using a MultiMeshInstance3D to draw an arbitrary number of identical grid meshes. The same mesh is used regardless of the level of detail and simply transformed into the correct position / size. The tile boundaries are passed using INSTANCE_CUSTOM to the shader which applies the heightmap in the vertex stage, so the whole terrain can be rendered in arbitrary detail without making any changes to the rendering pipeline.
I will get my act together and make a vertical slice this year
where we go one, we dot all
IKs and light banding fixes are looking good but I'm too scared of breaking my momentum in order to update and fix whatever breaks because of that right now ;-;
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