dotnetRDF AllegroGraphConnector XML error when querying

Question

Code

AllegroGraphConnector connector = new AllegroGraphConnector(
    "https://someid.allegrograph.cloud/",
    "root",
    "mystore");

string sparqlQuery = @"ASK { ?s ?p ?o }";

var result = connector.Query(sparqlQuery); // This lines throws error

The problem

When using any well-formed query, I get the following error:

Version number '1.1' is invalid. Line 1, position 16.

Full error (as image):

What have I tried?

Using the dotNetRdf.Client & dotNetRdf.Core packages instead of the full dotNetRdf NuGet package
Try different queries (malformed ones throw different error (MALFORMED), good ones all throw the one above.
Give my anonymous user sudo rights
Try AllegroGraphServer which did connect properly and didn't give errors (can't query with this instance though)
Look for answers in the docs/source code
Looked for similar answers on internet: first, second

Querying the store on the AllegroGraph web view does work (the above SPARQL query should simply return 'true'. I suspect the problem is any of the following:

Some compatibility/version issue (.NET, NuGet, dotnetRDF, XML)
dotnetRDF bug (seems unlikely though as my usage is VERY basic)
Misconfiguration of server (I just made a new repository on the root catalog)
Human error

Software

LINQPad 8 (.NET 8.0.3)
Visual Studio 2022 (.NET 8.0)
dotNetRdf

Update

When doing the same SPARQL query with only HttpClient using ?query I get the following result:




  
  true

The error therefore relates to the XML version 1.1 returned by the AllegroGraph server. It seems AllegroGraphConnector doesn't support parsing XML 1.1.

Finally

Thank you in advance for answering/commenting. Any help is welcome.

Please keep in mind that I am new to the Semantics Web world and thus new to AllegroGraph, dotnetRDF, SPARQL, etc.