DataDistribution: internal_error

We are currently seeing this error with Data Distributor
```
trace.10.167.69.22.4592.1770482233.Nvuo9Y.0.2.xml:
/mnt/logs/fdb/trace.10.167.69.22.4592.1770482233.Nvuo9Y.0.2.xml:
```

Any idea on steps we can take to recover the data distributor? It just keeps crash looping and isn't able to do any work. We are fine with losing a small amount of data (the shard) if needed vs losing the cluster.
We are also running fdb 7.3.69

Start with the Data Distributor trace and inspect foundationdb/fdbclient/KeyRangeMap.actor.cpp around line 297, using the reported assertion and backtrace as the entry point. Compare the failure with the 7.3.69 behavior and surrounding error handling. Done means identifying a reproducible cause and documenting a validated recovery path that avoids cluster loss, or clearly establishing whether shard loss is required.

Written by the indexing model from the issue text.