Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Biodistribution & persistence
Distribution to pigmented skin and uveal tract; potential melanin binding
“The distribution of [14C]mitapivat to melanin-containing tissues, such as pigmented skin and the uveal tract of the ocular system, indicates that mitapivat has the potential to bind melanin.”
Off-target aromatase inhibition causing reproductive organ toxicity in rats
“Noteworthy nonclinical findings were observed in the reproductive organs in the rats and were likely due to mitapivat-mediated aromatase (also known as cytochrome P450 [CYP19]) inhibition”