Mobile study board editor missing piece selection

[jxu]

Exact URL of where the bug happened

https://lichess.org/study

Steps to reproduce the bug

Create a new chapter on mobile site, select board editor

What did you expect to happen?

Board editor shows pieces buttons to add and remove pieces, like in landscape mode

What happened instead?

No piece buttons showed up

Operating system

Android 13

Browser and version (or alternate access method)

Firefox mobile latest

Additional information

[Carbrex]

Good first issue

[Carbrex]

This issue can be closed.