I have this code, but some event element are not fetched, how?

const updateEventTimes = async (
    productId: string,
    product: Product,
    db: Db,
    teamId: ObjectId,
    googleAccessToken?: string
) => {
    if (!productId || !product || !googleAccessToken) {
        await db.collection('logs').insertOne({
            api: 'fetchGoogleCalendar',
            createdAt: new Date(),
            severity: 'log',
            message: 'updateEventTimes failed',
            productId,
            product,
            googleAccessToken,
        })
        return
    }

    // Fetch the nextSyncToken from your database
    let nextSyncToken = null
    let nextPageToken = null
    let _eventTimes = { ...product.eventTimes }
    _eventTimes = Object.keys(_eventTimes)
        .filter((key) => key.length <= 4) // Keep keys that are 4 characters or less
        .reduce((obj, key) => {
            obj[key] = _eventTimes[key]
            return obj
        }, {})
    do {
        let url = `https://www.googleapis.com/calendar/v3/calendars/${product.googleCalendarId}/events?`
        if (nextPageToken) {
            url += `pageToken=${nextPageToken}`
        } else if (nextSyncToken) {
            url += `syncToken=${nextSyncToken}`
        }
        const response = await fetch(url, {
            method: 'GET',
            headers: {
                Authorization: `Bearer ${googleAccessToken}`,
            },
        })
        if (response.ok) {
            console.log(
                `Google calendar fetched for productId ${productId} at: `,
                new Date()
            )
            const data = await response.json()
            await db.collection('logs').insertOne({
                api: 'fetchGoogleCalendar',
                createdAt: new Date(),
                severity: 'log',
                message: 'Fetching calendar succeeded',
                data,
            })
            nextPageToken = data.nextPageToken
            if (data.nextSyncToken && !nextSyncToken) {
                nextSyncToken = data.nextSyncToken
            } else if (data.nextSyncToken && nextSyncToken) {
                nextSyncToken = null
            }
            for (let index = 0; index < data.items.length; index++) {
                const element = data.items[index]
                if (element.etag) {
                    let newEtag = element.etag.slice(1, -1)
                    _eventTimes[newEtag] = {
                        startTime: element.start?.dateTime,
                        endTime: element.end?.dateTime,
                        enableSale: true,
                        additionalInfo: 'foglalt',
                    }
                }
            }
        } else {
            await db.collection('logs').insertOne({
                api: 'fetchGoogleCalendar',
                createdAt: new Date(),
                severity: 'log',
                message: 'Fetching calendar failed',
            })
            const errorText = await response.text()
            console.error(
                `Error fetching calendar data: ${response.status} - ${errorText}`
            )
        }
    } while (nextPageToken || nextSyncToken)
    const dynamicKey = `products.${productId}.eventTimes`
    await db
        .collection<Team>('teams')
        .updateOne({ _id: teamId }, { $set: { [dynamicKey]: _eventTimes } })
    console.log(
        `Event times inserted to DB for productId: ${productId}, dynamicKey: ${dynamicKey}, teamId: ${teamId}`
    )
}