This is a quick fix for Feature use

spec/experiments/application_experiment_spec.rb

@@ -5,6 +5,12 @@ require 'spec_helper'
 RSpec.describe ApplicationExperiment do
   subject { described_class.new(:stub) }
 
+  it "naively assumes a 1x1 relationship to feature flags for tests" do
+    expect(Feature).to receive(:persist_used!).with('stub')
+
+    described_class.new(:stub)
+  end
+
   describe "publishing results" do
     it "tracks the assignment" do
       expect(subject).to receive(:track).with(:assignment)

spec/support/gitlab_experiment.rb

 # frozen_string_literal: true
 
+# This is a temporary fix until we have a larger discussion around the
+# challenges raised in https://gitlab.com/gitlab-org/gitlab/-/issues/300104
+class ApplicationExperiment < Gitlab::Experiment # rubocop:disable Gitlab/NamespacedClass
+  def initialize(*args)
+    super
+    Feature.persist_used!(name)
+  end
+end
+
 # Disable all caching for experiments in tests.
 Gitlab::Experiment::Configuration.cache = nil