Subgraph styling with classes fails to work when the subgraph is linked to other nodes.

[kovasap]

Description

When I try to use a class to style a subgraph that is linked to other nodes, the class does not apply.

Steps to reproduce

1. See the linked code sample.

Screenshots

No response

Code Sample

https://develop.git.mermaid.live/edit#pako:eNpVkU1PwzAMhv-KFTRx2ThxKhKnXSYhIcEBCcIhbZw1aupUiatumvbfcejWwSWJ7ccfr3NSTbSoKuVCnJrWJIaXtydNAE0wOW_RwYApRwLnQ6ju6tqtM6fY4WbyltvqcThoKnwe630yQwt95BZTcXkiTF9a7cqt1XfxIdlyrVbwEVOXL-_Mx4CXzFunubCEXykcYSo8TC0SCHbr5zNQZAieOrTAEbQiPLBWl-Sd4BIrZy5wjY0ZM86VCgk2YqZ7Bjz4zKX4dao_LTihYalvvXOYkFgmMhmM9Lb4sCzsqmFe2iJg0TpDv4v5x8xpm81zGUitVY-pN97Kx5xKWCsJ96hVJU9rUlfUnYUzI8f3IzWq4jTiWqU47ltVOROyWONgZeitNyKjX7yDoc8Yr_b5BzEPsfg

Setup

• Mermaid version: v11.4.1+bc2cc61
• Browser and Version: Chrome

Suggested Solutions

No response

Additional Context

No response