PyQGIS script crashes QGIS 3 when removing a custom pluginLayer which has custom legend

Question

I upgrade a 2.18 plugin to 3.4.

PluginLayer has been refactored and I could not create a custom legend as simple as previous major version of QGIS 2 :

QgsDefaultPluginLayerLegend was removed. Use QgsMapLayer::setLegend() to provide legend nodes for plugin layers. as it's written here https://qgis.org/api/api_break.html

I followed steps :

• create my custom pluginlayer
• add to mapLayer

QgsProject.instance().addMapLayer(layer)
legend = layer.makeLegend()
layer.setLegend(legend)

Here is my pluginLayer class :

class PSudLayer(QgsPluginLayer):
def init(self,session, type, name):
    QgsPluginLayer.init(self, type, name)
    self.layerType = type
    self.session=session
    self.conf = None
    self.transparency = 0
    self.setValid(True)
def makeLegend(self):
    return PSudLegend(self.session,self.conf['uuid'])

and here my custom legend

class PSudLegend(QgsMapLayerLegend):
def __init__(self, session, uuid):
    QgsMapLayerLegend.__init__(self)
    self.nodes = []
    url = session.baseUrl+'/geocat/legend/'+uuid
    r = session.get(url)
    self.legends = json.loads(r.readAll().data().decode())
    self.globalcount = 0
    self.countBoucle = 0
    self.countRecursive = 0
    self.icon = QIcon()

def recursiveLoad(self,legends, nodeLayer):
    self.countRecursive +=1
    self.countBoucle = 0
    size = legends['children'].__len__()
    for child in legends['children']:
        if 'children' in child:
            self.recursiveLoad(child, nodeLayer)
        else:
            if size > self.nodes.__len__(): # hack car la boucle passe plus d'une fois ....
                image = QPixmap()
                iStr= child["icon"].split(",")[1]
                i64 = base64.b64encode(iStr.encode()) # hack parsing error (multiple de 4)
                image.loadFromData(QByteArray.fromBase64(base64.b64decode(i64)))
                self.icon = QIcon(image)
                node = QgsSimpleLegendNode(nodeLayer,child['title'],self.icon)
                self.nodes.append(node)

def createLayerTreeModelLegendNodes(self, nodeLayer):
    if 'children' in self.legends:
        self.recursiveLoad(self.legends, nodeLayer)

    return self.nodes

def removeLegend(self):
    for node in  self.nodes:
        node = None
    self.nodes = None
    self.icon =None
    return True 

All works fine as I remove the layer from the treeLayerPanel. QGIS simply crashes.

I tried to remove nodes in my legend with no success and call it when removeLayer is called.

QgsProject.instance().layerWillBeRemoved.connect(self.PSudData.removeLayer)

def removeLayer(self,layerid):
for layer in self.parent.service_layers:
    if layer.id() == layerid:
        layer.legend.removeLegend()
        QgsProject.instance().removeMapLayer(layer)

I get a typeError when I tried the filtering option of the layerTree. PSudLegend.createLayerTreeModelLegendNodes(), index 0 has type 'QgsSimpleLegendNode' but 'QgsLayerTreeModelLegendNode' is expected Which I don't understand because QgsLayerTreeModelLegendNode is an abstract class and QgsSimpleLegendNode extends from QgsLayerTreeModelLegendNode.

When I tried to refreshLayerLegend() from the LayerTreeModel and I also get the same TypeError.

Very confused.