SDK 1.12.2 is available! Access it by running the Playdate Simulator and saying "yes" to an update, or download it from http://play.date/dev.
Note fixes at Playdate SDK Changelog, including fixes for OS 1.12.1. (No SDK for OS 1.12.1 was released, since 1.12.2 was known to be coming out soon after.)
Please let us know if you encounter any issues!