Csharp Entity Framework Core 8 dbcontext—无法以多对多关系添加某些行'

有人能解释一下为什么我得到这个错误吗

语句与FOREIGN KEY约束"FK_ArticleTag_Tags_ArticleId"冲突.冲突发生在数据库"Blog"，表"dbo. tags"，列"TagId"中

public class Article
{
    public Article()
    {
        Comments = new HashSet<Comment>();
        Tags = new HashSet<Tag>();
    }

    [Key]
    public int ArticleId { get; set; }
    public int? CategoryId { get; set; }

    [StringLength(30)]
    public string ArticleName { get; set; } = null!;
    public string? ArticleDescription { get; set; }
    public bool Visibility { get; set; }

    [ForeignKey("CategoryId")]
    [InverseProperty("Articles")]
    public virtual Category Category { get; set; }
    [InverseProperty("Article")]
    public virtual ICollection<Comment> Comments { get; set; }
    [ForeignKey("TagId")]         
    [InverseProperty("Articles")] 
    public virtual ICollection<Tag> Tags { get; set; }
}

public class Tag
{
    public Tag() 
    { 
        Articles = new HashSet<Article>();
    }

    [Key]
    public int TagId { get; set; }
    [Required]
    [StringLength(50)]
    public string Title { get; set; }

    [ForeignKey("ArticleId")]
    [InverseProperty("Tags")]
    public virtual ICollection<Article>? Articles { get; set; }
}

迁移后，有50篇文章和20个标签，我无法在ArticleId大于20的(自动生成的)ArticleTag表中添加新行.

我不知道这是怎么回事，有人能解释一下我做错了什么吗？