Broken API endpoint /eth/v1/beacon/light_client/updates

[zsfelfoldi]

The updates endpoint seems to be broken: http://104.248.139.137:9596/eth/v1/beacon/light_client/updates?start_period=10&count=1 returns {"statusCode":500,"error":"Internal Server Error","message":"finalizedBlockRoot not available 0xc23381411ab2aee8a7aa9dc63ebe7faac3220fe53582c03051e5879fb90ecfec"} (the node on the given address runs Sepolia but I have tried it with another node running Mainnet too and it returns the same error for any period between the Altair fork and the latest period)