Fix read contract bytes array type

CHANGELOG.md

@@ -7,6 +7,7 @@
 - [#3145](https://github.com/poanetwork/blockscout/pull/3145) - Pending txs per address API endpoint
 
 ### Fixes
+- [#3207](https://github.com/poanetwork/blockscout/pull/3207) - Fix read contract bytes array type output
 - [#3203](https://github.com/poanetwork/blockscout/pull/3203) - Improve "get mined blocks" query performance
 - [#3202](https://github.com/poanetwork/blockscout/pull/3202) - Fix contracts verification with experimental features enabled
 - [#3201](https://github.com/poanetwork/blockscout/pull/3201) - Connect to Metamask button

apps/explorer/lib/explorer/smart_contract/reader.ex

@@ -321,9 +321,20 @@ defmodule Explorer.SmartContract.Reader do
     Map.put_new(output, "value", bytes_to_string(value))
   end
 
-  defp new_value(%{"type" => "bytes" <> _number} = output, values, index) do
+  defp new_value(%{"type" => "bytes" <> number_rest} = output, values, index) do
+    if String.contains?(number_rest, "[]") do
+      values_array = Enum.at(values, index)
+
+      values_array_formatted =
+        Enum.map(values_array, fn value ->
+          bytes_to_string(value)
+        end)
+
+      Map.put_new(output, "value", values_array_formatted)
+    else
       Map.put_new(output, "value", bytes_to_string(Enum.at(values, index)))
     end
+  end
 
   defp new_value(%{"type" => "bytes"} = output, values, index) do
     Map.put_new(output, "value", bytes_to_string(Enum.at(values, index)))