Unable to parse indirect expansion with an ! in {!var}

[ChristinWhite]

I'm not using tree-sitter directly but I am using the Bash Language Server in a Visual Studio Code extension and any time I use an a ! character in a variable like {!var} I get an Failed to parse expression error

In an issue about this error the owner specified that the error was in tree-sitter and requested that an issue be opened here. bash-lsp/bash-language-server#43