22038 Run framework tests in sound null safety mode (cla: yes)

22041 Ensure root isolate create callback is invoked before the isolate is in the running phase. (cla: yes, waiting for tree to go green)

22052 Isolates launched by the engine instance use the settings of that instance. (cla: yes)

22055 Roll Fuchsia Mac SDK from pZ9FgVZTK… to WLxBkBnZa… (cla: yes, waiting for tree to go green)

22057 Roll Fuchsia Linux SDK from lPMs_KwnU… to gqS_DIjN4… (cla: yes, waiting for tree to go green)