Why does everything in bitcoin use double hash (HASH256) except BIP141?

UPDATE: Answered on twitter

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Going through the protocol, it seems like everything uses a double hash (OP_HASH256, OP_HASH160), except BIP-141 which uses the single hash (OP_SHA256) function.

Any reason why double-hash seemed to be agreed upon everywhere in the protocol, but was not deemed necessary for P2WSH or BIP16-P2WSH?

submitted by /u/brianddk
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