bug: "dataflow" toggle-able for "Inner flow" but not for flow itself

Describe the bug

I successfully enabled the "dataflow" feature on an "inner flow".

However, as it rendered weirdly, I thought I wanted to look into the sub-flow itself in fullscreen with the "dataflow" feature, but I cannot enable it as the toggle button is not presented to me.

To reproduce

Whilst trying to reproduce I noticed that the toggle-button seemingly randomly appeared and disappeared for both flows. I was not able to get it reproduced 1:1.

Expected behavior

Either it is toggle-able on both or none of the views.

And it should render in exactly the same way: The "dataflow" of the "inner flow" does not seem to render the Flow input correctly!

Screenshots

As inner flow

When opened the inner flow itself in the flow viewer:

Browser information

Chrome Version 126.0.6478.127

Application version

EE v1.355.3

Additional Context

Might not be related, but my developer console is spammed with:

Error: <path> attribute d: Expected number, "…,333 389.5,378 Mundefined,undefi…".

scheduler.BMtNMwrL.js

(Scheduler is not used for any of those flows!)