setStateInformation() and getStateInformation() issues in JUCE 5.4.4

[appjuce]

I am migrating my code from JUCE 5.4.3 to 5.4.4 and now my setStateInformation() and getStateInformation() both misbehave in 5.4.4.
Here is what I am doing in PluginProcessor.h. :

PluginProcessor()
  #ifndef JucePlugin_PreferredChannelConfigurations
						 ... ...   				
  #endif

   , parameters(*this, nullptr, "stabParams",
	           { std::make_unique<AudioParameterFloat>("a", "Parameter A", NormalisableRange<float>(-100.0f, 100.0f), 0.0f),
	             std::make_unique<AudioParameterInt  >("b", "Parameter B", 0, 5, 2) })   
   {}


void  getStateInformation(MemoryBlock& destData) 
{ 
    pluginStateInfoXML.reset(parameters.state.createXml().get());						      
    DBG("5.4.4. store XML: " << pluginStateInfoXML.get()->toString());	 // "Exception thrown: read access violation. this->data was nullptr."
    copyXmlToBinary(*pluginStateInfoXML.get(), destData);
}

void  setStateInformation(const void* data, int sizeInBytes)
{ 						 
    pluginStateInfoXML.reset(getXmlFromBinary(data, sizeInBytes).get());						 
	DBG("5.4.4. restore XML: " << pluginStateInfoXML.get()->toString());    // "Exception thrown: read access violation. this->data was nullptr."
    parameters.replaceState(ValueTree::fromXml(*pluginStateInfoXML.get()));
}

public:	 
    std::unique_ptr<XmlElement> pluginStateInfoXML;
    AudioProcessorValueTreeState parameters;

As commented in the quoted code, XmlElement::toString() call triggers an exception.

My question could be stated as:
Given the following code that works fine in JUCE 5.4.3:

    void  getStateInformation(MemoryBlock& destData)
    {
       pluginStateInfoXML.reset(parameters.state.createXml());
       DBG("5.4.3. store XML: " << pluginStateInfoXML.get()->createDocument(""));
       copyXmlToBinary(*pluginStateInfoXML.get(), destData);
    }

    void  setStateInformation(const void* data, int sizeInBytes)
    { 			
       pluginStateInfoXML.reset(getXmlFromBinary(data, sizeInBytes));
       DBG("5.4.3. restore XML: " << pluginStateInfoXML.get()->createDocument(""));
       parameters.replaceState(ValueTree::fromXml(*pluginStateInfoXML.get()));
    }

… what would be its equivalent that works in JUCE 5.4.4?

[MBO]

pluginStateInfoXML = parameters.state.createXml();

and

pluginStateInfoXML = getXmlFromBinary(data, sizeInBytes);

[appjuce]

Thanx