When editing a drawing a text with a "-" symbol is displayed OK. After saving & exiting the drawing the "-" is converted to:
As registering on draw.io's JIRA platform is not possible, I request a fix here...
We have a service desk over the JIRA, anyone can register https://desk.draw.io/servicedesk/customer/portal/7.
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The label isn't HTML and the entity is. Select the cell and in the right hand "text" panel tick "formatted text".