Teams Recurring Meeting Update Issue with Graph API

Start with the Microsoft Graph /me/events endpoint and the PATCH URL construction shown in the Node.js snippet, comparing eventId with instanceId. Reproduce the sequence of updating the series, updating one recurring instance, and updating the series again. Done would require identifying the source of the 500 response and documenting or confirming the supported update behavior; no repository file or test is mentioned.

I successfully created a recurring Teams meeting using the Graph API.
After that, I updated the entire recurring series using the Graph API, which worked successfully.
I then tried updating a single instance of the recurring series using the Graph API, and that also succeeded.

However, once I update any single instance of the recurring series, any subsequent attempt to update the entire recurring series results in a 500 Internal Server Error from the Graph API.

Below is the code snippet I’m using to update the meeting in Node.js:

process.env.teamsScheduleMeeting = "https://graph.microsoft.com/v1.0/me/events"

const headers = {
    'Authorization': `Bearer ${token}`,
    'Content-Type': 'application/json',
    'Prefer': `outlook.timezone="${payload?.timezone ? payload?.timezone : payload.booking.timezone}", outlook.body-content-type="text"`
};

const meetingData = {
    ...(payload?.title && { subject: payload?.title }),
    ...(payload?.startTime && payload?.endTime && payload?.timezone && {
        start: {
            dateTime: new Date(Number(payload?.startTime)).toISOString(),
            timeZone: payload?.timezone
        },
        end: {
            dateTime: new Date(Number(payload?.endTime)).toISOString(),
            timeZone: payload?.timezone
        }
    }),
    ...(payload?.recurrence && { recurrence: payload.recurrence }),
    ...(payload?.participants && Array.isArray(payload?.participants) && {
        attendees: payload.participants.map(email => ({ emailAddress: { address: email } }))
    })
};

const teamsMeetingUpdateUrl = `${process.env.teamsScheduleMeeting}/${payload.type === "recurringInstance" ? payload.instanceId : payload.eventId}`;

const existingEventDetails = await axios.get(teamsMeetingUpdateUrl, { headers });
const existingContent = existingEventDetails?.data?.body?.content;

if (payload?.description) {
    // Update the body content only if a new description is provided
    meetingData.body = {
        contentType: 'text', // Retain original or default to text
        content: existingContent.replace(/^(.*?)(\r\n|$)/, `${payload.description}$2`) // Replace first line with the new description
    };
}

const updateEvent = await axios.patch(teamsMeetingUpdateUrl, meetingData, { headers });
console.log('updateEvent---', updateEvent);

Can some one help me understand why the Graph API fails with a 500 error when updating the entire series after modifying a single instance?