1165 Fix bedrock generation in vanilla compatibility worlds. (commit e4940b063068c8e4a38f6ac21293798b3dea2f3f) 1166 Fix chunks sometimes being very slow to send to clients. (commit 872f3ab09b47a822994e3adfb86361c4b1f9e6bc) 1167 Add code for more reliable chunk saving (shadow paging IO), ...