Reports

I've run into a strange issue. I have a generic extension on interface .IDbGroups which defines a Groups property, but when it's invoked I get an InvalidOperationException.

Is there something I should know about about generic extensions and implementation?

Code:

public interface IDbGroups
{
    [Required]
    string Groups { get; set; }
}

public interface ISetting : IAssetsDbBase, IDbGroups
{
    ...
}

public sealed class Setting : AssetsDbBase, ISetting
{
    ...
    public string Groups { get; set; }
    ...

    public const string DefaultGroupName = "Assets";
}

[Expandable(nameof(Predicates.InGroupsImpl))]
public static MatchTypes DbInGroups<TEntity>(this TEntity item, string values) where TEntity : class, IDbGroups
    => DbUtility.ListMatches(item.Groups, values);
    
public static Expression<Func<TEntity, MatchTypes>> InGroupsImpl<TEntity>(string values) where TEntity : class, IDbGroups
    => e => DbUtility.ListMatches(e.Groups, values)

This line:
cache.Settings = await db.GetWorker<Setting>().WhereAsync(s => s.AppId.Equals(cache.App.Id) || s.AppId == null && s.DbInGroups(Setting.DefaultGroupName).Equals(MatchTypes.All));

Causes follow exception:
Inner Exception 1:
InvalidOperationException: No generic method 'InGroupsImpl' on type 'SLT.Assets.Extensions.LINQExtensions' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic.

Any suggestions would be great, I can't figure out why this happens. The error remains even if I remove

s.DbInGroups(Setting.DefaultGroupName).Equals(MatchTypes.All))

It accours when I query DbSet<Setting>
Weird

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