Some nested link anchors inside inline SVG aren't assigned key after pressing `f`

Describe the bug

Some link anchors nested inside an inline SVG do not get picked up as interactable after pressing f.

I have tried to investigate why this is, and if I've done anything wrong here, but I can't find what is exactly going wrong. I have noticed that an error is logged to the console if I hit f when I have the standalone SVG opened in the browser, if that helps.

To Reproduce

Steps to reproduce the behavior:

1. Go to URL https://svgo.dev/
2. Scroll down to the Integrations section, which features two clickable items in the SVG.
3. Press f
4. Observe, the Docusuaurs logo has a key associated with it, but the PostCSS logo does not.

The following image showcases the website with tab order displayed. You can see that that Vimium has associated a key with all interactable elements on the screen except one, the PostCSS logo:

The following is the standalone SVG, an error appears in the console when I open the local file in the browser and hit f:

TypeError: MutationObserver.observe: Argument 1 is not an object.

— ui_component.js:124:14

Browser:

Name 	Firefox
Version 	126.0
Build ID 	20240509170740
Distribution ID 	mozilla-flatpak
Update Channel 	release

Vimium:

Version 2.1.2
Last Updated 4 April 2024

Reproduce the issue at svgo.dev by opening the Integrations section and pressing f, then inspect ui_component.js around line 124 and the MutationObserver error. Trace why the PostCSS SVG link is skipped while the Docusaurus link is assigned a key. Done means both clickable SVG items receive keys and pressing f no longer logs the observer error.