Arrange | Import | Mermaid... does not import correctly on the desktop version for Windows (v26.0.4).

[bradlitterell]

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Describe the bug
Arrange | Import | Mermaid... does not import correctly on the desktop version for Windows (v26.0.4). It works correctly on the website with version v26.0.6. There are no closed bugs in this issue tracker that seem relevant.

Precisely what happens (on the desktop version) for flowcharts is that text box borders disappear, and arrows are formatted as if the mermaid text read --o instead of -->. That is they end in circles rather than arrows.

I only used graph/flowchart types and did not try any other mermaid inputs.

To Reproduce
Steps to reproduce the behavior:

1. Create a new drawing.
2. Select the "Blank Drawing" template.
3. Go to 'Arrange | Insert | Advanced | Mermaid...`
4. Observe the application offers this example graph:

graph TD;
  A-->B;
  A-->C;
  B-->D;
  C-->D;

Loading

5. verify the import type button at the bottom reads "Diagram" (the default).
6. Click "Insert"

Expected behavior
The typical mermaid rendering with arrows and boxes having lined borders. Here is an expected rendering:

https://mermaid.live/edit#pako:eNo9js0OgjAQhF-FzBlJsYChJib-XD3pyfTS2CpES0ktiUh4d2uJ7Onb2ZnNDLgaqcBwt6KtovNhzZso2i4Wm91M-0A7T9N1HwgxtLJa1NKnh5_O4SqlFQfzKIV9cPBm9D7ROXPqmyuYs52KYU13r8Bu4vnyW9dK4dShFr6CntVWNBdj9D-iZO2MPU5dQ-VgARvwBqNFmVBKyoys0mWapaSI0YORMcYnPCFJOU1GaJnTPF-OX7zzSeA

Screenshots
see Mermaid.live link for expected
actual:

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version v26.0.4
• specifically: draw.io-26.0.4-windows-no-installer.exe

Desktop (please complete the following information):

• OS: Windows 11

Additional context