Yes, it will spread. Likely the replacement will crack, too.

Why would the replacement crack? It was delivered to me like this

I don’t know if it can be fixed, but I wound do the replacement. I’m sure that table was way to expensive to accept with a crack like that. The discount would have to be major. I think you would need to talk to a woodworker to see if they could fill, repair it and at what cost to determine if the discount is sufficient. I had a similar issue with a wood bed from CB2, crack in footboard. It took 3 tries to get one that was acceptable.

Yes it was very expensive and they offered us 30% discount if we kept it but we are just afraid this crack will spread longer and bigger so not sure if its worth it

Get a replacement.

I agree, I would opt for the replacement. It will spread, you can count on it.

Seasonally, It may spread a bit, and it may close up a bit, due to changes in humidity. The problem is that those are pretty wide pieces to be making a table from, especially with complicated grain like that. When wood with those characteristics is glued up into a slab, the stresses are not evenly distributed and exert forces that can cause such cracking. It's even possible you may have another crack like that develop elsewhere. It's not like the table will fall apart, but you have to decide whether you can live with the appearance of the cracking. If you get a replacement that is constructed the same way from the same wood, you could end up with the same problem. When large tabletops like that are made, they often have a wood butterfly inlay or two inserted to keep the crack under control; some people like the look, some don't. What I can tell you is that no woodworker is going to be able to make a repair so that the crack disappears. If you put wood filler in it it, the crack will still be able to expand away from it, or come together with enough force to crumble the filler over time or elongate the crack.

https://www.carolinatimberworks.com/why-do-timbers-split-and-crack/

A timber will eventually air dry to the Equilibrium Moisture Content (EMC) of its environment. The EMC is the point at which wood is neither losing nor absorbing water. A timber’s moisture content is determined by the atmospheric humidity of the timber’s environment.

Above link & quote pertain to green wood timber frames...nevertheless, gives good background info for why wood behaves the way it does.

Think of wood like you would think of a household cellulose sponge. And how that sponge shrinks when it is bone dry. Or how chunks of firewood crack on the ends. No checking when green firewood is first cut--then checking after the green firewood has dried (seasoned) over a year or two or more.

Yes it was very expensive and they offered us 30% discount if we kept it

Not enough discount. The discount offer is only an ordinary 'on sale' price. AFAIC, the cracked table is a 75% off table.

Because it will crack (check) more. And the only quasi fix is to wait a couple or more years to glue/ fill the cracks. Which will then require a strip/ sand/ refinish of the tabletop. And the repair won't stay perfect because the wood will continue to squirrel around some.

ci_lantro-

Your link doesn't work. Is this the link you had in mind?:

https://www.carolinatimberworks.com/why-do-timbers-split-and-crack/

Yes, that is it. Thx for letting me know. Now fixed it in the post.