(v2) new home page feature in alpha-55 appears to randomly choose sidebars to show

[taylorreece]

🐛 Bug Report

I have a docusaurus-built site with multiple sidebars, and recently took advantage of #2652 to designate a page to be the "home" page.

The home page appears to choose a random sidebar of the my five available to present alongside the home page.

I'm not sure how the sidebar shown alongside the home page is chosen, nor why a seemingly random one shows up with each compilation of my site.

Have you read the Contributing Guidelines on issues?

Yes

To Reproduce

(Write your steps here:)

Using alpha-55, create a docusaurus page with multiple sidebars and a page designated the 'home' page. Refresh the home page several times, sometimes in different browsers. Stop and restart your development server. You'll find that you see different sidebars, seemingly randomly.

I have a sample at https://github.com/taylorreece/docusaurus-bug-poc
If you pull that repo down, and

cd website
yarn run start

The sidebar you see at http://localhost:3000/docs will be a random side bar. If you stop and restart your dev server a few times you'll see other random side bars crop up.

Expected behavior

I guess I would expect the first sidebar defined in sidebars.js to be used... maybe it would be good to be able to designate which sidebar to present?

(Write what you thought would happen.)

Actual Behavior

Refresh the home page several times, sometimes in different browsers. Stop and restart your development server. You'll find that you see different sidebars, seemingly randomly.

Your Environment

• Docusaurus version used: 2.0.0-alpha.55
• Environment name and version (e.g. Chrome 81.0.4044.138, Node.js 12.16.2):
• Operating system and version (desktop or mobile): MacOS 10.15.4

Reproducible Demo

(Paste the link to an example repo, including a siteConfig.js, and exact instructions to reproduce the issue.)