RCS1248 triggers when used in expression trees, but pattern-matching 'is' operator cannot be used in expression trees

[riley-van-hengstum]

Product and Version Used:
4.1.0

Steps to Reproduce:

roslynator_null_check_style = pattern_matching
dotnet_diagnostic.RCS1248.severity = suggestion # "Normalize null check"

Actual Behavior:

var users = dbContext.Users
    .Where(user => user.Address != null) // <-- RCS1248 triggers here
    .ToList();

(using Queryable.Where)

Expected Behavior:
RCS1248 doesn't trigger when used in expression tree.