Classes with generic mixins applied to base do not highlight correctly

[Benny Powers - עם ישראל חי!]

Consider this file:

interface C {}
class B<T, U> {}

function F(s: any) { return class G<T, U> extends s {} }

export class A extends F(B)<D, E> implements C {}

export class A extends B<D, E> implements C {}

Expected: both instances of the word implements highlight as modifier keywords
Actual: only the second instance highlights properly

debug info with package info

{
  "atom": "1.54.0",
  "platform": "darwin",
  "release": "18.7.0",
  "activeCommunityPackages": [
    "dracula-syntax: 3.0.2",
    "framer-ui: 2.0.0",
    "api-docs: 0.0.6",
    "atom-ide-debugger-node: 0.7.3",
    "atom-ide-debugger-python: 0.7.3",
    "atom-ide-javascript: 1.5.0",
    "atom-import-cost: 1.2.0",
    "atom-inline-blame: 0.0.10",
    "atom-jq: 0.7.0",
    "atom-typescript: 14.1.2",
    "audio: 1.5.7",
    "autocomplete-module-import: 0.3.0",
    "autocomplete-paths: 2.12.18",
    "busy-signal: 2.0.1",
    "choose-pane: 0.8.0",
    "color-picker: 2.3.0",
    "counter: 0.3.5",
    "custom-title: 1.0.1",
    "docblockr: 0.13.7",
    "emmet: 2.4.3",
    "file-icons: 2.1.46",
    "gitlab-integration: 0.4.8",
    "haskell-debug: 0.3.6",
    "haskell-pointfree: 0.2.0",
    "highlight-column: 0.5.4",
    "highlight-line: 0.12.0",
    "highlight-selected: 0.17.0",
    "ide-bash: 1.0.11",
    "ide-cpp: 0.1.0",
    "ide-haskell-hoogle: 0.1.2",
    "ide-html: 0.6.2",
    "ide-json: 0.2.1",
    "indent-guide-improved: 1.4.13",
    "intentions-colorpicker: 1.0.1",
    "intentions-numbers: 1.0.4",
    "javascript-drag-import: 0.1.13",
    "language-haskell-scoped: 0.1.2",
    "less-than-slash: 0.20.0",
    "linter-coverage: 0.3.0",
    "linter-docker: 0.3.2",
    "linter-eslint: 8.5.5",
    "linter-jsonlint: 1.4.0",
    "linter-pylint: 2.1.1",
    "linter-sass-lint: 1.9.0",
    "linter-stylelint: 4.5.1",
    "linter-write-good: 0.9.3",
    "minimap-split-diff: 0.3.7",
    "modular-snippets: 0.1.3",
    "npm-outdated: 0.6.0",
    "pane-browser: 1.6.0",
    "pigments: 0.40.6",
    "plantuml-viewer: 0.7.2",
    "regex-railroad-diagram: 0.19.4",
    "relative-numbers: 0.9.1",
    "remember-folds: 0.3.0",
    "split-diff: 1.6.1",
    "teletype: 0.13.4",
    "terminal-tab: 0.6.0",
    "todo-show: 2.3.2",
    "tree-ignore: 0.6.2",
    "vim-mode-plus: 1.36.4",
    "vim-mode-plus-keymaps-for-surround: 0.2.1",
    "language-graphql: 1.0.0",
    "language-plantuml: 0.2.0",
    "language-markdown: 0.37.0",
    "language-github-actions: 0.1.0",
    "language-fish-shell: 1.1.0",
    "language-haml: 0.32.1",
    "language-ini: 1.23.0",
    "language-haskell: 1.21.0",
    "language-liquid: 0.7.0",
    "language-mermaid: 0.6.0",
    "language-nunjucks: 4.2.1",
    "language-patch: 1.2.0",
    "language-confluence-wiki: 0.2.0",
    "language-vue: 0.26.0",
    "react: 0.18.0",
    "atom-beautify: 0.33.4",
    "atom-ide-base: 2.3.2",
    "atom-ide-datatip: 0.23.2",
    "atom-ide-definitions: 0.4.1",
    "atom-ide-hyperclick: 1.0.9",
    "atom-ide-markdown-service: 2.0.0",
    "atom-ide-outline: 1.17.0",
    "atom-ide-signature-help: 0.15.1",
    "linter: 3.3.0",
    "linter-ui-default: 3.2.3",
    "minimap: 4.39.7",
    "minimap-find-and-replace: 5.0.8",
    "minimap-git-diff: 4.3.6",
    "minimap-linter: 2.2.2"
  ]
}

Edit: having submitted this issue I'm now noticing that GitHub's highlighter appears to have the same issue, so maybe it's upstream. However note VSCode's rendering:

[Amin Yahyaabadi]

@bennypowers I think you opened the issue in the wrong repository

This is a syntax highlighting issue and it should be opened here:
https://github.com/atom/language-typescript

[Benny Powers - עם ישראל חי!]

moved to atom/language-typescript#57