Error when build with FPSTR in version 6.2.0 and 6.2.1

Created by: tarzan115

Hi @bblanchon I got a problem with version 6.2.0 and 6.2.1 but it works with 6.1.0

here is a small code

#include <ArduinoJson.h>

const char TEST_1[] PROGMEM = "TEST_1";
const char TEST_2[] PROGMEM = "TEST_2";

const char *json = "{\"TEST_1\":{\"TEST_2\":[1,2,3]}}";
/*
{
    "TEST_1": {
        "TEST_2":[
            1,2,3
        ]
    }
}
*/

void parseJSON()
{
    DynamicJsonDocument doc(200);
    deserializeJson(doc, json);
    JsonObject root = doc.as<JsonObject>();
    JsonArray TEST = root[FPSTR(TEST_1)][FPSTR(TEST_2)];
    return;
}

void setup()
{
    parseJSON();
    return;
}

void loop()
{
    return;
}

and here is the log

In file included from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../Strings/StringTypes.hpp:23:0,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../JsonVariantComparisons.hpp:9,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../JsonVariantBase.hpp:8,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../JsonVariant.hpp:13,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/ValueSaver.hpp:7,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./JsonArrayData.hpp:8,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/JsonArray.hpp:7,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/DynamicJsonDocument.hpp:7,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.hpp:9,

                 from D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson.h:9,

                 from D:\Documents\WorkSpace\Arduino\testJson\testJson.ino:1:

D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../Strings/ZeroTerminatedRamString.hpp: In instantiation of 'const bool ArduinoJson::Internals::IsString<__FlashStringHelper*>::value':

D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/JsonObjectSubscript.hpp:124:5:   required by substitution of 'template<class TString> typename ArduinoJson::Internals::enable_if<ArduinoJson::Internals::IsString<TString*>::value, const ArduinoJson::Internals::JsonObjectSubscript<const TString*> >::type ArduinoJson::Internals::JsonVariantSubscripts<TImpl>::operator[](const TString*) const [with TString = TString; TImpl = ArduinoJson::Internals::JsonObjectSubscript<const __FlashStringHelper*>] [with TString = __FlashStringHelper]'

D:\Documents\WorkSpace\Arduino\testJson\testJson.ino:22:55:   required from here

D:\Documents\Arduino\libraries\ArduinoJson\src/ArduinoJson/./Data/../Strings/ZeroTerminatedRamString.hpp:49:35: error: invalid application of 'sizeof' to incomplete type '__FlashStringHelper'

   static const bool value = sizeof(TChar) == 1;

                                   ^

exit status 1
Error compiling for board Generic ESP8266 Module.

thank you in advance!