At the current time, Redis documents that:

Vector set is a new data type that is currently in preview and may be subject to change.

As such, the corresponding library feature must also be considered subject to change:

1. Existing bindings may cease working correctly if the underlying server API changes.
2. Changes to the server API may require changes to the library API, manifesting in either/both of build-time or run-time breaks.

While this seems unlikely, it must be considered a possibility. If you acknowledge this, you can suppress this warning by adding the following to your csproj file:

<NoWarn>$(NoWarn);SER001</NoWarn>

or more granularly / locally in C#:

#pragma warning disable SER001