It's been noticed that JetBrains JetBrains Runtime has recently upgraded to version 21, and with it, a collection of bugs has emerged. This upgrade is a major release, and not uncommon for JetBrains to experience a fair share of bugs with their new version. For a thorough understanding of the new features, please refer to JetBrains official website at https://www.jetbrains.com/idea/whatsnew/. The new features are outlined in detail, providing a comprehensive understanding of the improvements and changes made in this upgrade.