https://github.com/facebook/react-native/issues/49245#issuecomment-2665527685

Check that the following line:

SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) DEBUG";

has been added inside project.pbxproj in debug XCBuildConfiguration block:

83CBBA201A601CBA00E9B192 /* Debug / = {
  isa = XCBuildConfiguration;
  buildSettings = {
    ALWAYS_SEARCH_USER_PATHS = NO;
    CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
    CLANG_CXX_LANGUAGE_STANDARD = "c++20";
    ...
    REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
    SDKROOT = iphoneos;
    SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) DEBUG";
    USE_HERMES = true;
  };
  name = Debug;
};