Comments in a ternary expression is unexpectedly split

Prettier 2.8.8
Playground link

--parser babel

Input:

function buildNamespaceReexport() {
  return (
    constantReexports
      ? template.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;
          if (key in EXPORTS && EXPORTS[key] === NAMESPACE[key]) return;

          EXPORTS[key] = NAMESPACE[key];
        });
      `: // Also skip already assigned bindings if they are strictly equal
        // to be somewhat more spec-compliant when a file has multiple
        // namespace re-exports that would cause a binding to be exported
        // multiple times. However, multiple bindings of the same name that
        // export the same primitive value are silently skipped
        // (the spec requires an "ambiguous bindings" early error here).
        template.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;
          if (key in EXPORTS && EXPORTS[key] === NAMESPACE[key]) return;

          Object.defineProperty(EXPORTS, key, {
            enumerable: true,
            get: function() {
              return NAMESPACE[key];
            },
          });
        });
    `
  )({
    NAMESPACE: namespace,
    EXPORTS: metadata.exportName,
    VERIFY_NAME_LIST: metadata.exportNameListName
      ? template`
            if (EXPORTS_LIST.indexOf(key)) return;
          `({ EXPORTS_LIST: metadata.exportNameListName })
      : null,
  });
}

Output:

function buildNamespaceReexport() {
  return (
    constantReexports
      ? template.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;
          if (key in EXPORTS && EXPORTS[key] === NAMESPACE[key]) return;

          EXPORTS[key] = NAMESPACE[key];
        });
      ` // Also skip already assigned bindings if they are strictly equal
      : // to be somewhat more spec-compliant when a file has multiple
        // namespace re-exports that would cause a binding to be exported
        // multiple times. However, multiple bindings of the same name that
        // export the same primitive value are silently skipped
        // (the spec requires an "ambiguous bindings" early error here).
        template.statement`
        Object.keys(NAMESPACE).forEach(function(key) {
          if (key === "default" || key === "__esModule") return;
          VERIFY_NAME_LIST;
          if (key in EXPORTS && EXPORTS[key] === NAMESPACE[key]) return;

          Object.defineProperty(EXPORTS, key, {
            enumerable: true,
            get: function() {
              return NAMESPACE[key];
            },
          });
        });
    `
  )({
    NAMESPACE: namespace,
    EXPORTS: metadata.exportName,
    VERIFY_NAME_LIST: metadata.exportNameListName
      ? template`
            if (EXPORTS_LIST.indexOf(key)) return;
          `({ EXPORTS_LIST: metadata.exportNameListName })
      : null,
  });
}

Expected behavior:

We can see that the comment is wrongly split in two, if I add a newline before the : then it works.

Start with the linked Prettier Playground reproduction using the babel parser, comparing the provided input and output around the ternary expression and its comments. Done means formatting no longer splits the comment incorrectly when the existing input is formatted.