Search dialogue remains at "Initializing search" #2703

• I've read the contribution guidelines and agree with them

I've found a bug and checked that ...

• ... the problem doesn't occur with the default MkDocs template
• ... the problem is not in any of my customizations (CSS, JS, template)
• ... the documentation does not mention anything about my problem
• ... there are no open or closed issues that are related to my problem

Description

On mobile, search doesn't print "Type to start searching" when the search index is built:

Reported here: https://news.ycombinator.com/item?id=27300766

Expected behavior

"Type to start searching" is printed.

Actual behavior

"Initializing search" remains.

Steps to reproduce the bug

1. Open search on mobile

Project configuration

theme:
  name: material

System information

• OS: mac OS
• Browser: Chrome