Masking at daycare?

My son is 3 and goes to daycare full time, and receives some early intervention services there. Yesterday his teachers were talking about how he knows a lot of language but it's hard to get it out of him and he often prefers to stay quiet. Well, at home he tends to talk and sing non stop, reciting the alphabet or making up songs or saying "jargon" that I don't understand. I'm autistic too but only diagnosed this year as an adult. I remember when I went to school I was thought of as very shy and rarely talked in that environment. (I wasn't actually shy, it was how my autism was showing up..) I'm wondering, is he developing a kind of masking? I don't know how I feel about it, he is such a happy little guy at home, it makes me sad to think of him hiding his personality at daycare but maybe he is learning that the things he likes to do are not seen as "normal." 😥