Minecraft wiki entry for Development_versions, associated text: Fixed several crashes that could occur when attempting to sign into Xbox Live / Microsoft account. (MCPE-20548, MCPE-64245)
Fixed a crash that could occur when attempting to sign in when offline. (MCPE-29021)
Fixed various sign in and account linking issues on Nintendo Switch. (MCPE-65511)
Fixed an issue that would sometimes prevent game invites from being sent/received correctly on mobile devices.