revert #2010

Author: purpshell

src/Socket/messages-recv.ts

@@ -1190,24 +1190,13 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 		}
 
 		const encNode = getBinaryNodeChild(node, 'enc')
-		const unavailableNode = getBinaryNodeChild(node, 'unavailable')
-
 		// TODO: temporary fix for crashes and issues resulting of failed msmsg decryption
 		if (encNode && encNode.attrs.type === 'msmsg') {
 			logger.debug({ key: node.attrs.key }, 'ignored msmsg')
 			await sendMessageAck(node, NACK_REASONS.MissingMessageSecret)
 			return
 		}
 
-		if (unavailableNode && unavailableNode.attrs?.type == 'view_once') {
-			logger.warn(
-				{ id: node.attrs.id, from: node.attrs.from, type: unavailableNode.attrs?.type },
-				'received unavailable message, sending positive ack'
-			)
-			await sendMessageAck(node)
-			return
-		}
-
 		const {
 			fullMessage: msg,
 			category,