Class diagrams: Only first self-reference is rendered

Description

When I add more than one self-reference to a node on a class diagram, only the last one is rendered.

Steps to reproduce

Create more than one self-reference for any node.

Screenshots

No response

Code Sample

classDiagram
classG <-- classG : ref1
classG <-- classG : ref2

on https://mermaid.js.org/syntax/classDiagram.html :

Setup

• Mermaid version: 11.4.0
• Browser and Version: Chrome