.Net: Bug: MEVD: Member field access doesn't work in filter translators

[westey-m]

The following filter is failing with System.NotSupportedException : Member access for 'mystring' is unsupported - only member access over the filter parameter are supported

string mystring = "foo"
r => r.str == mystring

[roji]

Repro test:

private int _memberField = 8;

[ConditionalFact]
public virtual Task Member_field()
    => this.TestFilterAsync(
        r => r.Int == this._memberField,
        r => (int)r["Int"] == this._memberField);