LR Bypass Edge In A Chain

In a chain, the edge from `A` to `C` leaves the bottom of `A`, runs under `B` and enters the bottom of `C`, so `B --> C` keeps its own arrowhead (#2043, #2044).

lr-bypass-edge-in-a-chain.mmd
flowchart LR
    A --> B
    B --> C
    C --> D
    A --> C
Output
Flowchart, Zombie Mermaid A B C D

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