Piecewise 21.12.6 has been released. The 1.1~1.4MB update will be applied automatically by Steam. The changes include:

• Fix unhelpful error message when trying to use Pleroma emoji react blocks on Mastodon instances
  
• Fix crash when using "replace [needle] with [text] in [haystack]" block
  
• Fix crash when using Mastodon "I [state] user [user]" block
  
• Fix orange halo on modal close buttons on macOS
  
• Fix modal close buttons showing on Windows and Linux
  
• Fix dramatic color change when opening Workshop dialog and using dark mode