Height of plot is 0 until resize after changing layout input

Hello,

I'm having a bit of trouble with my charts in a dashboard. I've implemented theme switching in my application using system variables and Angular Material. I'm able to change my chart's look and feel according to the colors of my theme. However, the container will collapse when I switch to a new theme because the plotly-plot element has a height of 0 until I resize the window.

Injectable

import { DOCUMENT } from '@angular/common';
import {
  computed,
  effect,
  inject,
  InjectionToken,
  signal,
} from '@angular/core';
import { WA_WINDOW } from '@ng-web-apis/common';

export const THEME = new InjectionToken('Theme', {
  factory: () => {
    const w = inject(WA_WINDOW);
    const d = inject(DOCUMENT);
    const darkMode = signal(true);
    const setDarkMode = effect(() =>
      d.documentElement.classList.toggle('light', !darkMode())
    );
    return {
      darkMode,
      textColor: computed(() => {
        darkMode();
        return getComputedStyle(d.documentElement).getPropertyValue(
          '--mat-app-text-color'
        );
      }),
    };
  },
});

Component

...
  readonly #theme = inject(THEME);

  readonly ageGenderChartLayout = computed<Partial<Plotly.Layout>>(() => ({
    barmode: 'stack',
    autosize: true,
    margin: {
      l: 60,
      r: 50,
      b: 100,
      t: 50,
      pad: 4,
    },
    title: 'People by Age',
    paper_bgcolor: 'rgba(255,255,255,0)',
    plot_bgcolor: 'rgba(255,255,255,0)',
    font: {
      color: this.#theme.textColor(),
    },
  }));
...

Template

<mat-card>
  <mat-card-content>
    @if (mapData$ | async; as mapData) {
    <plotly-plot [data]="mapData"
                 [layout]="mapLayout()"
                 [config]="{responsive: true, mapboxAccessToken: mapboxToken, displaylogo: false, modeBarButtonsToRemove: ['toImage']}" />
    } @else {
    <mat-spinner style="margin: auto;"></mat-spinner>
    }
  </mat-card-content>
</mat-card>

Before switching themes:

After switching themes (which updates the layout input of the plotly-plot component):

How can I have responsive charts while still have their containers "see" their actual height? is this a Plotly chart issue?

Start with the Angular template's component and the layout input updated by the theme signal. Reproduce a theme switch, then compare the chart container height before and after the update without resizing the window. Done means responsive charts retain their actual container height immediately after the layout changes.