Hey Mauro,
Nothing changed in the plugin (intentionally) to limit the number of questions in a form/quiz.
Is the problem affecting both back-end editing and front-end? It sounds like maybe you are running into server limits?
Can you take a look at this troubleshooting guide and see if that helps? https://formidableforms.com/knowledgebase/i-have-a-long-form-why-did-the-options-at-the-end-of-the-form-stop-saving/
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