Successfully executed OPC UA method closes client connection

Using QOpcUaNode::callMethod() to execute a server method returns an error status and closes my client connection even if the method is successfully executed.

Result and status returned are:

result: QVariant(Invalid)
status: QOpcUa::BadConnectionClosed

This is using the Open62541 backend.

This is how I am calling a method (sorry, but no formatting works fine in this editor):

const QString methodId("ns=2;s=::ms:start_process");

const QVector<QOpcUa::TypedVariant> params = {

, {val2, QOpcUa::Int32} };

mNodeMS->callMethod(methodId, params);