Templated interface not being checked properly

[wallw-teal]

I have a templated interface, a class which implements the interface, and a little driver app file: ifoo.js:

goog.module('IFoo');

/**
 * @interface
 * @template T
 */
class IFoo {
  /**
   * @param {T=} opt_obj
   * @return {T}
   */
  foo(opt_obj) {}
};

exports = IFoo;

bar.js:

goog.module('Bar');
const IFoo = goog.requireType('IFoo');

/**
 * @implements {IFoo<Object>}
 */
class Bar {
  /**
   * @inheritDoc
   */
  foo(opt_obj) {
    opt_obj = opt_obj || {};
    opt_obj['type'] = 'Bar';
    return opt_obj;
  }
};

exports = Bar;

app.js:

goog.module('test');
const Bar = goog.require('Bar');
console.log(new Bar().foo());

Error:

./app.js:3: ERROR - [JSC_WRONG_ARGUMENT_COUNT] Function module$exports$Bar.prototype.foo: called with 0 argument(s). Function requires at least 1 argument(s) and no more than 1 argument(s).
console.log(new Bar().foo());
            ^^^^^^^^^^^^^^^

./bar.js:11: ERROR - [JSC_HIDDEN_INTERFACE_PROPERTY_MISMATCH] mismatch of the foo property on type module$exports$Bar and the type of the property it overrides from interface module$exports$IFoo
original: function(this:module$exports$IFoo, (Object|null)=): (Object|null)
override: function(this:module$exports$Bar, ?): ?
  foo(opt_obj) {
  ^^^
2 error(s), 0 warning(s), 96.5% typed

compiler args:

--dependency_mode PRUNE --summary_detail_level 3 --language_in ECMASCRIPT_2018 --warning_level VERBOSE --jscomp_error accessControls --jscomp_error checkPrototypalTypes --jscomp_error checkRegExp --jscomp_error checkTypes --jscomp_error checkVars --jscomp_error conformanceViolations --jscomp_error const --jscomp_error constantProperty --jscomp_error deprecatedAnnotations --jscomp_error duplicateMessage --jscomp_error es5Strict --jscomp_error externsValidation --jscomp_error functionParams --jscomp_error globalThis --jscomp_error invalidCasts --jscomp_error misplacedTypeAnnotation --jscomp_error missingGetCssName --jscomp_error missingOverride --jscomp_error missingPolyfill --jscomp_error missingProperties --jscomp_error missingProvide --jscomp_error missingRequire --jscomp_error missingReturn --jscomp_error missingSourcesWarnings --jscomp_error moduleLoad --jscomp_error msgDescriptions --jscomp_error nonStandardJsDocs --jscomp_error partialAlias --jscomp_error polymer --jscomp_error strictModuleDepCheck --jscomp_error strictPrimitiveOperators --jscomp_error suspiciousCode --jscomp_error typeInvalidation --jscomp_error undefinedNames --jscomp_error undefinedVars --jscomp_error underscore --jscomp_error unknownDefines --jscomp_error unusedLocalVariables --jscomp_error unusedPrivateMembers --jscomp_error uselessCode --jscomp_error untranspilableFeatures --jscomp_error visibility --jscomp_warning deprecated --jscomp_off reportUnknownTypes --jscomp_off strictCheckTypes --jscomp_off strictMissingProperties --compilation_level ADVANCED --angular_pass true --generate_exports true --output_wrapper (function(){%output%}).call(window); --js_output_file test.min.js --js '!../node_modules/google-closure-library/closure/goog/**test.js' --js '!../node_modules/google-closure-library/third_party/**test.js' --js '../node_modules/google-closure-library/closure/goog/**.js' --js '../node_modules/google-closure-library/third_party/**.js' --js './**.js' --entry_point goog:test --hide_warnings_for /google-closure-library/

This does not occur when processing the same code as a single file or when using goog.provide/require instead of goog.module. See this sample repo for an example of each of those along with the above example.