Strip was flagged for deletion in `seq_transform_handle_overwrite()` on `STRIP_OVERLAP_IS_FULL`. Then it is removed in `SEQ_edit_strip_split()` before it should be. Handle `STRIP_OVERLAP_IS_FULL` in separate loop. This may not be complete solution, because in example file overlap is caused between 2 transformed strips and one that is "static". Such operation should not be possible in first place. This fixes the crash at lest, so improvement in behavior can be handled separately. Differential Revision: https://developer.blender.org/D12751