有趣的错误，请考虑将其发布到EF Core GitHub问题跟踪器。

根据想法，你尝试过的应该做

modelBuilder.Entity<SystemUser>()
    .HasMany(x => x.LogBooks)
    .WithMany(x => x.SystemUsers)
    .UsingEntity<Dictionary<string, object>>("LogBookSystemUsers",
        x => x.HasOne<LogBook>().WithMany().HasForeignKey("LogBookId"),
        x => x.HasOne<SystemUser>().WithMany().HasForeignKey("SystemUserId"),
        x => x.ToTable("LogBookSystemUsers", "LogBooks"));

它适用于任何其他FK属性名称，但{RelatedEntity}Id调用关联实体PK属性的时间除外ID。

作为解决方法，直到它得到解决，在配置关系之前，先明确定义所需的联接实体属性：

// add this
modelBuilder.SharedTypeEntity<Dictionary<string, object>>("LogBookSystemUsers", builder =>

{
    builder.Property<int>("LogBookId");
    builder.Property<int>("SystemUserId");
});
// same as the original
modelBuilder.Entity<SystemUser>()
    .HasMany(x => x.LogBooks)
    .WithMany(x => x.SystemUsers)
    .UsingEntity<Dictionary<string, object>>("LogBookSystemUsers",
        x => x.HasOne<LogBook>().WithMany().HasForeignKey("LogBookId"),
        x => x.HasOne<SystemUser>().WithMany().HasForeignKey("SystemUserId"),
        x => x.ToTable("LogBookSystemUsers", "LogBooks"));