Do I need to report my 90-day TM30 notification at Samut Prakan after extending my ED Visa at Chang Wattana?

Your TM30 slip means that you stay at that address and as you mention you did this on Jun 10th. As long as you keep on living on that address you are okay, if you move to a different address you or your landlord need to register your new address.

Samut Prakan can be a mixed bag, on my last four 90 day reports I have only been asked one time to show my TM.30 and that was back in January. You don't need to update your TM.30, but you may need to show them you have one on file.

James Anderson Formally a TM30 need to be filed within 24 hours of arrival to a new location. However immigration offices enforce this differently. Some require it for every place, some require it when you are in a new province and some only after you arrive from abroad. TM30 is not connected to TM47 or an application of stay. It is only connected to your movement in the kingdom. You need to ask your immigration in your current province how they enforce this law. In other words, you do not update a TM30 for a extension or a 90 days report, you update it when you are on a new location, continuously

the latter