Can't Filter subtable using date gt: I'm trying to filter records where an invoice date is greater than a horizon date. I get records back, but some of the vendors have invoice dates dating before the horizon (and none after). In other areas, I'm using filters on subtables, but none where the date can be used as a filter. where clause:

const whereClause = {
      AND: [
        {
          InvoiceTransaction: {
            some: {
              InvoiceDate: { gt: horizon }
            }
          }
        },
        {
      ...(searchString?
          {
            VendorName: { contains: searchString },
          }
      : {}),
        }
      ]
    }

The schema

model Vendor {
  VendorPKID          Int      @id @default(autoincrement())
  VendorUno           Int      @unique
  VendorNumber        Int?
  VendorID            String?  @db.VarChar(10)
  VendorName          String?  @db.VarChar(40)
  NameUno             Int?
  VendorTypeCode      String?  @db.VarChar(5)
  AddressUno          Int?
  Address1            String?  @db.VarChar(60)
  Address2            String?  @db.VarChar(60)
  City                String?  @db.VarChar(60)
  State               String?  @db.VarChar(5)
  PostalCode          String?  @db.VarChar(50)
  Note                String?  @db.VarChar(Max)
  Active              Boolean  @default(false)
  ActiveFromDate      DateTime @db.Date
  ModifiedDate        DateTime @default(now()) @db.DateTime
  ModifiedBy          String   @db.VarChar(30)

  InvoiceTransaction  InvoiceTransaction[]
}

Setting horizon to: 2020-01-11T000000.000Z or 2015-01-11T000000.000Z makes no difference. Both return the same records