This is usually a problem with RocksDB. As a quick fix, you can switch to LMDB. Add the LMDB dependency to deps.edn and remove the RocksDB dependency:

{:deps {com.biffweb/biff {...
                          :exclusions [com.xtdb/xtdb-rocksdb]}
        com.xtdb/xtdb-lmdb {:mvn/version "1.21.0-beta2"}

Then update config.edn:

{:prod {:biff.xtdb/kv-store :lmdb
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