I don't think it's heat related. My Masdie bicolor grew some leaves this summer and they were normal, even in the 40°C heat. It was doing the same thing as yours in late winter/early spring, and if I remember right the humidity wasn't very high (40% instead of the usual 60-70) and because I was so busy at that time I wasn't watering as often, so it got dry between waterings. As soon as I picked up a normal watering schedule again it seemed that the problem solved itself. Mine's in a plastic pot with sphag.
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Camille
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