Passing minContextSlot value in getTokenAccountsByOwner, but it’s always return same result

Hello Solana Team,

I am passing minContextSlot value in getTokenAccountsByOwner, but it’s always return same result.
Here is my curl query
curl --location --request POST ‘https://solana-api.projectserum.com’ \ –header ‘Content-Type: application/json’ \ –data-raw ’
{ “jsonrpc”: “2.0”, “id”: 1, “method”: “getTokenAccountsByOwner”, “params”: [ “5Xm6nU1Bi6UewCrhJQFk1CAV97ZJaRiFw4tFNhUbXy3u”, { “mint”: “ETAtLmCmsoiEEKfNrHKJ2kYy3MoABhU6NQvpSfij5tDs” }, { “encoding”: “jsonParsed” }, { “minContextSlot”:“1587” } ] }’

API document url - JSON RPC API | Solana Docs