Tierprice can't save float percentage value #18651. Display percentage on PDP in case it is set explicitly.

Author: Maksym Novik

app/code/Magento/Catalog/Pricing/Render/PriceBox.php

@@ -69,9 +69,11 @@ public function jsonEncode($valueToEncode)
     /**
      * Get random string
      *
-     * @param int $length
+     * @param int         $length
      * @param string|null $chars
+     *
      * @return string
+     * @throws \Magento\Framework\Exception\LocalizedException
      */
     public function getRandomString($length, $chars = null)
     {
@@ -93,4 +95,14 @@ public function getCanDisplayQty(Product $product)
         }
         return true;
     }
+
+    /**
+     * @param float $percent
+     *
+     * @return string
+     */
+    public function formatPercent(float $percent):string
+    {
+        return rtrim(number_format($percent, 2), '.0');
+    }
 }

app/code/Magento/Catalog/view/base/templates/product/price/tier_prices.phtml

@@ -77,7 +77,7 @@ $product = $block->getSaleableItem();
                             $price['price_qty'],
                             $priceAmountBlock,
                             $index,
-                            $tierPriceModel->getSavePercent($price['price'])
+                            $block->formatPercent($price['percentage_value'] ?? $tierPriceModel->getSavePercent($price['price']))
                         )
                         : __('Buy %1 for %2 each', $price['price_qty'], $priceAmountBlock);
                 ?>