Checkpoint sync failure?
Checkpoint sync appears to fail with an SSZ error on the current release of nimbus.  For example:

```
$ nimbus_beacon_node trustedNodeSync --data-dir=/home/nimbus/data --trusted-node-url=https://checkpoint-sync.holesky.ethpandaops.io --backfill=false
NTC 2024-09-19 09:38:54.794+00:00 Starting trusted node sync                 databaseDir=/home/nimbus/data/db backfill=false reindex=false syncTarget=finalized restUrl=https://checkpoint-sync.holesky.ethpandaops.io
NTC 2024-09-19 09:38:54.808+00:00 Downloading checkpoint state               syncTarget=finalized restUrl=https://checkpoint-sync.holesky.ethpandaops.io stateId=finalized
ERR 2024-09-19 09:39:04.805+00:00 Unable to download checkpoint state        error="SSZ BeaconState: object dynamic portion starts at invalid offset" syncTarget=finalized restUrl=https://checkpoint-sync.holesky.ethpandaops.io stateId=finalized
$ nimbus_beacon_node --version
Nimbus beacon node v24.8.0-bf4abf-stateofus
Copyright (c) 2019-2024 Status Research & Development GmbH

eth2 specification v1.5.0-alpha.5

Nim Compiler Version 2.0.8 [Linux: amd64]
```

This works with other beacon nodes (lighthouse, prysm, teku), however I don't know if they are asking for SSZ or JSON hence the error could be with the SSZ served by the server rather than the decoding by nimbus.