Mermaid diagrams not rendering invisible edges as per mermaid live editor

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This should result in A, B, C horizontal with X, Y, Z vertical to the right of C

flowchart LR

A
B
C

subgraph vertical
direction TB
    X
    Y
    Z
end

A --> B --> C

%% These don't appear to do anything
C ~~~ X
C ~~~ Y
C ~~~ Z

X --> C
Y --> C
Z --> C

Currently see this:

Should see this: