Sideband 2.1.0 was up for a few hours containing RNS 1.5.1. Since there was a few bugs in that related to all the new features, I decided to pull it and re-compile.
If your current Sideband version lists RNS 1.5.1 in the info screen, it's a good idea to grab the new build. The bugs are not really that likely to occur on the user-end, more on large transport nodes and such, but still, didn't want to leave them hanging.
This applies to the APK/appimage/EXE builds of course. If you're running Sideband from the wheel, you can just update RNS to 1.5.2 using pip or rngit.