can't get /eth/v1/beacon/blob_sidecars

[CroutonDigital]

Describe the bug

I run prysm node with next arguments:

  ethereum-prysm-node-arbitrum:
    container_name: ethereum-prysm-node-arbitrum
    restart: always
    image: gcr.io/prysmaticlabs/prysm/beacon-chain:v5.0.0
    command: >
      --rpc-host=0.0.0.0
      --rpc-port=4000
      --grpc-gateway-host=0.0.0.0
      --grpc-gateway-port=7500
      --datadir=/root/prysm
      --p2p-host-ip=65.108.201.189
      --p2p-tcp-port=13010
      --p2p-udp-port=12010
      --accept-terms-of-use
      --jwt-secret=/jwtsecret 
      --execution-endpoint=http://ethereum-node:8551
      --checkpoint-sync-url=http://testing.mainnet.beacon-api.nimbus.team

But can't get /eth/v1/beacon/blob_sidecars

Has this worked before in a previous version?

Never used before

🔬 Minimal Reproduction

curl http://ethereum-prysm-node-arbitrum:7500/eth/v1/beacon/blob_sidecars/8633650 -H "accept: application/json"

got {"message":"Block not found: block not found: no block roots at slot 8633650","code":404}/

Error

{"message":"Block not found: block not found: no block roots at slot 8633650","code":404}/

Platform(s)

Linux (x86)

What version of Prysm are you running? (Which release)

v5.0.0

Anything else relevant (validator index / public key)?

No response