The vector pass and potentially other vectors that store 4 values are
stored wrongly, in particular, the last channel is ignored. To fix this
we identify if a vector pass is 4D and store the information in the
result meta data, then use this information to either save a 3D or a 4D
pass in the File Output node.
This is a partial fix for the GPU compositor only. The complete fix for
the CPU compositor will be submitted separately as it is not
straightforward and will likely require a refactor.
Pull Request: https://projects.blender.org/blender/blender/pulls/124522
57a6832b17