It doesn't violate any law of thermodynamics (in as much as it does violate the arrow of time in some sense). The problem is hawking radiation is pure white noise which means if a laplace demon existed (and for our purposes, when quantum mechanics meets real world, we assume an infinite number of laplace demons exist and are created every moment), it cannot reverse a black hole back into its constituents that fell in. This is a HUGE problem.

However, there was a solution to this published in 2019. Just look up Black Hole Information Paradox and it should appear as the last section on the wiki page.