What happens to unprocessed messages in DLT afterwards?

In Distributed Ledger Technology (DLT), unprocessed messages are usually placed in a special pool or queue, where they are stored until validated by network validators or nodes. If a message fails validation, it may be rejected or placed in a separate error list for further analysis. Some systems allow for reattempts to process such messages or notify the sender of the issue. Ultimately, unprocessed messages are not lost but either await reprocessing or are recorded for diagnostics.