Systems, methods, and devices for video coding that may obtain a rectangular chroma block having first and second square sub-blocks are disclosed. These systems, methods, and devices may also decode a first coded block flag (CBF) for the first square sub-block to indicate whether the first square sub-block includes at least one nonzero transform coefficient. These systems, methods, and devices may also decode a second CBF for the second square sub-block to indicate whether the second square sub-block includes at least one nonzero transform coefficient and not decoding a CBF for the rectangular chroma block.