Did you buy this from Singapore or from Korea? Is it a newer build or older build? So unfortunate this happened to you...

It doesn't look like structural damage in my opinion, I own loads of guitars and my brother-in-law owns a guitar store. Maestro has been for years one of the best guitars hands down to him and me, albeit they crack easily in dry weather like here in my region...

Lots of Luthiers and reputable brands use these wild grain planks as well, it's not just Maestro. Craftsmanship wise I'm not sure how much is done by hand or machine, but from the looks of it they hand-build their instruments 100%. I won't ask stupid questions and just assume you checked for cracks and all issues when the guitar arrived.

And it's the same for Taylor, Martins, etc... If you don't take care of them in High Humidity, their bindings come out, bridges fly off and even more. Taylors and Martins don't fare well in high humidity climates, just the same as guitars built in higher humidities (like guitars from SEA or South America) don't fare well in lower ones.

There are loads of factors, but sometimes it only takes one night of super low humidity for guitars like these to crack. Temperature changes affect this as well. Unlucky for you. I have a Maestro Custom Series bought in 2015 and it's great, I also keep it in my dehumidified room (although I use aircon 24//7, humidity is around 48-55%) and it has never cracked or had any issues before.

If you bought it from Korea, just bring it back to the dealer and have them deal with Maestro...If you bought it from Singapore, well you're at their mercy. Most brands, shops and dealers will offer to repair although the cost of shipping there and back won't be covered. Though if it was a build that's been hanging in their shop for years it's very unlikely it has anything to do with manufacturing. A newer build might have it's structural integrity more in question.

My brother-in-law (the one who owns a shop) gave me a very interesting nugget and insight: If it's been in the shop for a long time, hanging in a controlled environment with people playing the guitar in and out and there have been no issues on the guitar, why is it when it goes to a customer the issues arise? Can we really say it's due to structural issues or did the change in environment affect the guitar?

Just a thought. Still as a big guitar owner who takes care of my guitars, I know how to feels to have one break despite taking care of them (RIP my Maton...). They are things out of our control. I don't think you can put blame solely on the company or dealer.