Let's Encrypt has not yet decided to e.g. continue supporting OCSP for certificates with the must_staple feature extension enabled or e.g. to either refuse or simply not add the must_staple flag when renewing.
My advice would be to follow What will happen to Must-Staple and the API Announcements - Let's Encrypt Community Support category while Let's Encrypt makes up their mind on what to do with regard to must_staple.