Fenix: [Bug] hit testing doesn't reach the right element

[karlcow]

Steps to reproduce

1. Go to https://www.laposte.fr/particulier/outils/trouver-un-point-d-envoi-de-colis-ou-de-retrait?query=94140
2. Tap in the area where the zip code 94140 is displayed
3. A list of one item appears with 94140 Alfortville, France
4. Tap this item

Expected behavior

• The input changes with this value
• A map is displayed on this city

Actual behavior

Nothing is happening

Device information

• Android device: Pixel 2, Android 10
• Fenix version: Firefox Preview Nightly (Nightly 200603 06:00) Build 21550609

Note:

• This is working in chrome
• Expanding the area for the suggestion (padding,margin) so it takes more screen real estate and is not anymore close to the input, and the selection is working.
• Initial webcompat report https://github.com/webcompat/web-bugs/issues/53520

[ekager]

Filed https://bugzilla.mozilla.org/show_bug.cgi?id=1643209