itemize autocompletion does not work with beamer class

[K-Maehashi]

Preliminary questions [Required]

If I set the document class to article (or letter), the autocompletion for itemize works but not with beamer. How should I set it up? I checked this section and LaTeX-Workshop/data/packages/ folder but could not figure out by myself.

Disable all the other extensions except for LaTeX Workshop, restart VS Code, and check that you still see this issue. [Required]

You still see this issue?: Yes

Make sure to visit the wiki FAQ before filling an issue.

You visited the wiki?: Yes
The only issue I could find on autocompletion was "Autocompletion for \includegraphics seems incomplete".

If your issue is with compiling a document (not having to do with finding the root file of a project), check first that you can compile manually.

You can compile a TeX document manually?: Yes

Describe the bug [Required]

itemize autocompletion does not work.

To Reproduce

Type \begin{itemi

Expected behavior

Autocompletion for itemize shows up.

Screenshots

Desktop [Required]

Please write exact version numbers. Please don't write latest instead of exact numbers.

• OS: macOS Mojave
• VS Code version: Version: 1.56.2
• Extension version: v8.18.0
• TeX distribution version: TeX Live 2018

Additional questions

Are you using VSCodium?

No

Are you using LaTeX Workshop with VS Code Remote?

No

If the answer is Yes, please write which one you are using. Write the versions of the remote extension.

• Remote Containers/Remote SSH/Remote WSL
• Remote Extension Version: [e.g. 0.48.0]

Additional context

Add any other context about the problem here.