This isn't necessarily an issue (yet), more of a question.
SolidQueue.app_executor becomes Rails.application.executor here.
According to https://guides.rubyonrails.org/threading_and_code_execution.html#reloader and https://guides.rubyonrails.org/threading_and_code_execution.html#wrapping-application-code, the appropriate thing to use for job queues is reloader not executor. So Rails.application.reloader.
I don't understand Rails internals well enough to understand the distinction or why it matters, but wanted to put the question to the group in case it was an oversight.