Refresh Token Expiry Error Message is different in different versions of keycloak

Refresh Token Expiry giving a different error messages when called from two different versions of keycloak.
In keycloak 7, Error Message is Response Body : “{“error”:“invalid_grant”,“error_description”:“Refresh token expired”}”
In keycloak 10.0.1, Error Message is "Response body: {“error”:“invalid_grant”,“error_description”:“Token is not active”}

Why this inconsistency?