Tax system not working on eCommerce Catalog SPI products

Product:
Wix Studio, using the custom eCommerce Catalog SPI

Question & Additional information:
I have a fully functional store using a custom catalog plugin that being connected to one of my CMS collections.
Most of the store’s backend works find including the checkout and payments but the entire Taxes system of Wix Studio does not work at all on my custom catalog items. I tried using both “Tax should be added at checkout” & “Tax is already included in my prices” settings, then I check the tax summaries using the cart’s estimateCurrentCartTotals function (or the default cart & checkout pages) and all tax field values are zero.
As you can see in the example response I’ve got, the tax rate is 0 even though the tax rate on my tax settings is not.

Tax summary result:

"pricesBreakdown": {
  "totalPriceAfterTax": {
    "amount": "1250",
    "convertedAmount": "1250.00",
    "formattedAmount": "1,250.00 ₪",
    "formattedConvertedAmount": "1,250.00 ₪"
  },
  "totalPriceBeforeTax": {
    "amount": "1250",
    "convertedAmount": "1250.00",
    "formattedAmount": "1,250.00 ₪",
    "formattedConvertedAmount": "1,250.00 ₪"
  },
  "taxDetails": {
    "taxableAmount": {
      "amount": "1250",
      "convertedAmount": "1250.00",
      "formattedAmount": "1,250.00 ₪",
      "formattedConvertedAmount": "1,250.00 ₪"
    },
    "taxRate": "0",
    "totalTax": {
      "amount": "0",
      "convertedAmount": "0",
      "formattedAmount": "0.00 ₪",
      "formattedConvertedAmount": "0.00 ₪"
    },
    "rateBreakdown": [],
    "taxBreakdown": []
  },

Tax settings screenshot: