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