we changed the semantics (and name) of the first tuple element: refcount -> flags thus, better invalidate existing cache.
@@ -671,7 +671,7 @@ def load_chunks_hash(repository) -> bytes:
return hash
-CHUNKINDEX_HASH_SEED = 1
+CHUNKINDEX_HASH_SEED = 2
def write_chunkindex_to_repo_cache(repository, chunks, *, clear=False, force_write=False):