Fetching message in a thread

//IDK WHAT THE FUCK IS THIS PART
            const messages2 = await thread.messages.fetch()
            const messages1 = await thread.messages.fetch({
                limit: 1,
                after: thread.id,
            })
            //IDK WHAT THE FUCK IS THIS PART

            const message = await thread.messages.fetch({
                limit: 1,
                after: 0,
            })
            console.log(message)

thread.messages.fetch({
                limit: 1,
                after: 0,
            })

threadCreate

console.log(message)

Collection(1) [Map] {
  '1216352305750736956' => <ref *1> Message {
    channelId: '1216352305750736956',
    guildId: '992300928067698759',
    id: '1216352305750736956',
    createdTimestamp: 1710071388424,
    type: 0,
    system: false,
    content: '@Violet',
    author: User {
      id: '856956452740792320',
      bot: false,
      system: false,
      flags: [UserFlagsBitField],
      username: 'ivioleti',
      globalName: 'Violet',
      discriminator: '0',
      avatar: 'a1c7fdbf18258cf177318958181cebb4',
      banner: null,
      accentColor: null,
      avatarDecoration: null
    },
    pinned: false,
    tts: false,
    nonce: null,
    embeds: [],
    components: [],
    attachments: Collection(2) [Map] {
      '1216352306090737715' => [Attachment],
      '1216352306598117437' => [Attachment]
    },
    stickers: Collection(0) [Map] {},
    position: 0,
    roleSubscriptionData: null,
    resolved: null,
    editedTimestamp: null,
    reactions: ReactionManager { message: [Circular *1] },
    mentions: MessageMentions {
      everyone: false,
      users: [Collection [Map]],
      roles: Collection(0) [Map] {},
      _members: null,
      _channels: null,
      _parsedUsers: null,
      crosspostedChannels: Collection(0) [Map] {},
      repliedUser: null
    },
    webhookId: null,
    groupActivityApplication: null,
    applicationId: null,
    activity: null,
    flags: MessageFlagsBitField { bitfield: 0 },
    reference: null,
    interaction: null
  }
}

message.mentions.users.size> 0

message.mentions

                if (message.mentions.users.size > 0) {
                                     ^
TypeError: Cannot read properties of undefined (reading 'users')
    at Timeout._onTimeout (/home/container/Events/Client/thread.js:65:38)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
Node.js v21.5.0

async execute(thread) {
        if (thread.parent.id === '1139062893573328966') {
            const channel = thread.guild.channels.cache.get(
                '1014042418074624071',
            )
            const Ch_Log = thread.guild.channels.cache.get(
                '1202976505542615140',
            )

            const length = ['First Strike', 'Second Strike', 'Third Strike']


            
            //IDK WHAT THE FUCK IS THIS PART
            const messages2 = await thread.messages.fetch()
            const messages1 = await thread.messages.fetch({
                limit: 1,
                after: thread.id,
            })
            //IDK WHAT THE FUCK IS THIS PART
            
            const message = await thread.messages.fetch({
                limit: 1,
                after: 0,
            })
            console.log(message)
}
}

 const messages = await thread.messages.fetch({
                    limit: 1,
                    after: 0,
                })
                const message = messages.first()