These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.51 s (backtrack: 0/20).

[ebuild     UD ] net-libs/ngtcp2-1.20.0-r1::gentoo [1.21.0::gentoo] USE="openssl ssl -gnutls -verify-sig" 669 KiB

Total: 1 package (1 downgrade), Size of downloads: 669 KiB