Can't input Japanese in Windows Firefox

[tats-u]

Please describe the bug you are seeing

Same symptom as facebook/docusaurus#8952

How can we best reproduce the bug?

No response

Which version of Docusaurus and @cmfcmf/docusaurus-search-local are you using?

2.4.0
1.1.0

Which Node.js version are you using?

18

Which theme are you using?

Yes, I am using @docusaurus/theme-classic

How does your plugin config look like?

No response

Additional context

This issue doesn't occur in development environment (npm run start).
Production build is required (npm run build +α)