swift中我的LinkedList的remove函数中的bug

class Node<T> {
    var value: T
    var next: Node<T>?
    
    init(value: T) {
        self.value = value
    }
}

class LinkedList<T> {
    var head: Node<T>?
    var tail: Node<T>?
    
    func remove(value: T) {
        guard let head = head else {
            // 空链表
            return
        }
        
        if head.value == value {
            // 移除头节点
            self.head = head.next
            if head.next == nil {
                // 链表只有一个节点
                self.tail = nil
            }
            return
        }
        
        var previousNode = head
        var currentNode = head.next
        
        while let node = currentNode {
            if node.value == value {
                // 移除中间节点
                previousNode.next = node.next
                if node.next == nil {
                    // 移除尾节点
                    self.tail = previousNode
                }
                return
            }
            
            previousNode = node
            currentNode = node.next
        }
    }
}