A method for video decoding includes determining, based on prediction information, whether the current block uses a flexible partition type. Reconstructed samples of the reference block are stored in a cache memory, which stores reconstructed samples of coding regions of a first size comprising a coding tree unit (CTU) of the current block and reconstructed samples of at least one coding region of the first size comprising a CTU adjacent to the CTU of the current block. The cache memory stores either (i) only reconstructed samples of the coding regions of the CTU of the current block or (ii) reconstructed samples of coding regions of a second size of the CTU of the current block and reconstructed samples of at least one coding region of the second size of the CTU adjacent to the CTU of the current block.