Just to be pedantic, scientific laws break down at “ground zero” of the Big Bang. It’s more like they were converged to just after it - so we already have an example of truth, at least in the form of scientific laws, not pre-existing in the universe right there.
More generally speaking, just as dissecting the brain and finding no consciousness, finding no algorithms deep inside a circuit board, or manipulating a flower and finding no intrinsic colour, discovering no coldness at the essence of a snowflake, or drilling to the centre of the earth and finding no centre of gravity, we attribute truth to reality. We don’t find truth in it. We discover ways in which to model the world that describe and predict it to a certain degree of accuracy. Calling 4 “4” and 8 “8” is just seeing a shape, making a noise, and saying it and some arrangement of reality are the same. It’s then no shock that, given our association, we find our association is correct when 4 + 4 = 8. Circular.
Is human vision a perfect representation of what reality “looks like”? The culmination of all our senses seems to enable us to survive for some quantum of time, at least in the way humans happen to understand time. What if there was so much more to reality than we could apparently perceive of it? More than extra dimensions, but entirely revolutionary versions of perception that we could never even possibly conceive? What if we see only the very tip of the iceberg? If we have any access to “truth preexistent in reality” we are complacent beyond belief to think it’s anything more than an iota - if at all. In fact, a theory I have landed upon, and take really very seriously is that it’s lies and falsity that give meaning to anything - not truth. Truth says nothing, it’s tautology. But when we say “that is a tree” and point to a tree, the word tree isn’t what we’re pointing at, we’re not touching anything, you have to understand the gesture of pointing as following a line from the finger to the first general arrangment of presumed common sensation and pattern recognition as the intended subject of conversation… there are so many factors to distort the fact that “it seems like something exists” into something that means anything to anyone. The understanding of truth at all requires this, paradoxically, and it needs a mind for all the sense data to be passed into to even exist as a concept, nevermind relate to anything at all in the first place.