Are you sure? The linker changes are quite invasive and Android Q is in beta. Every Android version since 4.4 was released in August or later, so I hope that Go 1.13 will be out just in time for Q final.
I just saw this issue on the 1.12.2 milestone coming from the release notes. As it's not backported to 1.12 (understandably), shouldn't it be removed from the milestone as that is effectively used as a changelog?