Readonly properties are no longer readonly when using backing store

[rangp]

While generating a c# client with kiota version 1.21.0, I noticed that readonly properties are no longer readonly when using a backing store.

My readonly property was generated like this:

public double? AveragePriceGross { get; private set; }

After re-generating the client with a backing store, it now looks like this and I can set the property, even though it is marked as readonly in my api definition

        public double? AveragePriceGross
        {
            get { return BackingStore?.Get<double?>("average_price_gross"); }
            set { BackingStore?.Set("average_price_gross", value); }
        }

I understand that with backing store enabled, one can always change the property by manually changing the value in the underlying store, but I think the behavior should be consistent and the generated properties should either always or never be readonly, independent of whether a backing store is used.