Interactions between sub-block based intra block copy and different coding tools

An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:

• determine, for a conversion between a current block of a video and a bitstream of the video, that the current block is split into multiple sub-blocks, wherein each of the multiple sub-blocks is coded in the bitstream using a corresponding coding technique according to a pattern;
• and
• perform the conversion based on the determining;
• wherein the pattern specifies that a first sub-block of the multiple sub-blocks is coded using a sub-block-based intra-block copy (sbIBC) coding technique in which reference samples from a video region are used.

A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:

• determining that the current block is split into multiple sub-blocks, wherein each of the multiple sub-blocks is coded in the bitstream using a corresponding coding technique according to a pattern;
• and
• generating the bitstream based on the determining;
• wherein the pattern specifies that a first sub-block of the multiple sub-blocks is coded using a sub-block-based intra-block copy (sbIBC) coding technique in which reference samples from a video region are used.