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When the bottom-left (or top-right) reference samples cross the picture edge, the part outside the picture was filled from the last in-picture sample before the constrained_intra_pred substitution, which only runs up to the picture edge. If that sample belongs to an inter CU, its raw value stayed in the out-of-picture part instead of the substituted one (8.4.4.2.2), and the prediction no longer matched the encoder or HM. Seen with x265 at 1080p, 64x64 CTBs and constrained intra prediction: TUs in the partial bottom CTB row next to inter CUs mismatch from there on.