[Embedded Sandbox] Autocomplete suggestions popup gets stuck and does not disappear

[funayamateppei]

Description

I am using Apollo Sandbox (via NestJS integration). When typing in the query editor, the autocomplete suggestions popup gets "stuck" on the screen. It does not disappear after selecting a suggestion, pressing Escape, or clicking elsewhere. The only way to remove it is to reload the browser page.

Steps to Reproduce

1. Open Apollo Sandbox.
2. Start typing a query or mutation in the editor.
3. The autocomplete suggestions popup appears.
4. Select a suggestion or press Escape or click elsewhere.
5. The autocomplete popup remains on the screen and overlays other text. This happens consistently every time.

Expected Behavior

The autocomplete suggestions popup should disappear immediately after selecting a suggestion, pressing Escape, or clicking outside of it.

Screenshots

Environment

• OS: macOS 15.6.1 (Build 24G90)
• Browser: Google Chrome 143.0.7499.170 (Official Build) (arm64)
• Apollo Server: 4.11.3
• NestJS GraphQL: 12.2.2
• NestJS Apollo Driver: 12.2.2
• Access URL: http://localhost:3000/graphql (embedded sandbox)
• Language/Locale: ja-JP (Japanese)

Additional Context

• This issue significantly disrupts the workflow as the stuck popup blocks code visibility constantly.
• Unsure if this is related to the Japanese locale/IME environment.
• The issue occurs in the embedded sandbox served by Apollo Server, not on https://studio.apollographql.com.