At https://bitcoin.sipa.be/miniscript/, if I enter this miniscript:

sha256(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa)

I receive the expected script structure:

OP_SIZE <20> OP_EQUALVERIFY OP_SHA256
<aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa> OP_EQUAL

For hash160/ripemd160 however, the hash is missing in the script. For example:

hash160(aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa) results in:

OP_SIZE <20> OP_EQUALVERIFY OP_HASH160  OP_EQUAL

(<a....> is missing before OP_EQUAL).

using hash160(H) correctly outputs:

OP_SIZE <20> OP_EQUALVERIFY OP_HASH160 <h> OP_EQUAL