Expected behavior vs actual behavior

After upgrading to Rails 8.0.0, all serializers fail when a controller calls render json: <model instance> with the error:

can't modify frozen Hash: {:serialization_context=>#<ActiveModelSerializers::SerializationContext:0x000000012b99a008 @request_url="http://127.0.0.1:3000/things/1", @query_parameters={}, @url_helpers=#<Module:0x0000000128bf4ec8>, @default_url_options={}>, :namespace=>nil}

Same application/serializers works fine with Rails 7.2.1.1.

(If you believe that this issue should instead be reported to rails/rails, please feel free to close as such)

Steps to reproduce

rails _8.0.0_ new MyApp --api
bundle add active_model_serializers
rails generate scaffold Thing name:string
rake db:migrate
rails console <<< 'Thing.create!(name: "test")'
rails server
curl http://127.0.0.1:3000/things/1

Environment

ActiveModelSerializers Version (commit ref if not on tag): 0.10.14

Output of ruby -e "puts RUBY_DESCRIPTION": ruby 3.3.6 (2024-11-05 revision 75015d4c1f) [arm64-darwin24]

OS Type & Version: macOS 15.1.1

Integrated application and version (e.g., Rails, Grape, etc): Rails 8.0.0