In Flowchart, direction of subgraph links should affect positioning more than inter-graph node links

[tribbloid]

Description

here is a flowchart with only subgraph links:

flowchart TD
    subgraph input
        x
        y
    end

    subgraph eq
        subgraph "before"
            def(("÷"))
            tup(("▚"))
        end

        tup o--o def

        subgraph "after"
            direction TB
            dx(("÷"))
            dy(("÷"))
            ta(("▚"))
            tb(("▚"))
            ta -->|a1| dx
            ta -->|a2| dy
            tb ---|b1| dx
            tb ---|b2| dy
        end
    end

    subgraph "output"
        a
        b
    end

    input ~~~ eq
    eq ~~~ output

Loading

here is a similar one with both:

flowchart TD
    subgraph input
        x
        y
    end

    subgraph eq
        subgraph "before"
            def(("÷"))
            tup(("▚"))
        end

        tup o--o def

        subgraph "after"
            direction TB
            dx(("÷"))
            dy(("÷"))
            ta(("▚"))
            tb(("▚"))
            ta -->|a1| dx
            ta -->|a2| dy
            tb ---|b1| dx
            tb ---|b2| dy
        end
    end

    subgraph "output"
        a
        b
    end

    input ~~~ eq
    eq ~~~ output
    
    x --- tup
    y --- tup
    x --o dx
    y --o dy
    a --> def
    b --- def
    a --o ta
    b --o tb

Loading

as you can see, the positioning/layout is completely discarded.

Steps to reproduce

just use the above 2 code snippets in the browser

Screenshots

No response

Code Sample

No response

Setup

• Mermaid version: unknown
• Browser and Version: [Chrome, Edge, Firefox] Chrome Version 130.0.6723.116 (Official Build) (64-bit)

Suggested Solutions

No response

Additional Context

No response