I'm getting the same issue, and I am also getting the following error to...
"XCBBuildService unexpectedly quit" with the option to send a report to apple and to reopen.
This is the error report that is generated when I try to run the live preveiw...
use of undeclared type 'LandmarkRow_Previews'
----------------------------------------
failedToBuildDylib: /Users/bazaroff/Library/Developer/Xcode/DerivedData/BuildingListsAndNavigation-gfmaoxuafhsjxqadzpijdbjvbmer/Build/Intermediates.noindex/Previews/Landmarks/Intermediates.noindex/BuildingListsAndNavigation.build/Debug-iphonesimulator/Landmarks.build/Objects-normal/x86_64/LandmarkRow.2.preview-thunk.swift:6:11: error: use of undeclared type 'LandmarkRow_Previews'
extension LandmarkRow_Previews {
^~~~~~~~~~~~~~~~~~~~
/Users/bazaroff/Library/Developer/Xcode/DerivedData/BuildingListsAndNavigation-gfmaoxuafhsjxqadzpijdbjvbmer/Build/Intermediates.noindex/Previews/Landmarks/Intermediates.noindex/BuildingListsAndNavigation.build/Debug-iphonesimulator/Landmarks.build/Objects-normal/x86_64/LandmarkRow.2.preview-thunk.swift:7:6: error: replaced accessor for 'previews' could not be found
@_dynamicReplacement(for: previews) private static var __preview__previews: some View {
^
/Users/bazaroff/Library/Developer/Xcode/DerivedData/BuildingListsAndNavigation-gfmaoxuafhsjxqadzpijdbjvbmer/Build/Intermediates.noindex/Previews/Landmarks/Intermediates.noindex/BuildingListsAndNavigation.build/Debug-iphonesimulator/Landmarks.build/Objects-normal/x86_64/LandmarkRow.2.preview-thunk.swift:15:11: error: use of undeclared type 'LandmarkRow'
extension LandmarkRow {
^~~~~~~~~~~
/Users/bazaroff/Library/Developer/Xcode/DerivedData/BuildingListsAndNavigation-gfmaoxuafhsjxqadzpijdbjvbmer/Build/Intermediates.noindex/Previews/Landmarks/Intermediates.noindex/BuildingListsAndNavigation.build/Debug-iphonesimulator/Landmarks.build/Objects-normal/x86_64/LandmarkRow.2.preview-thunk.swift:16:6: error: replaced accessor for 'body' could not be found
@_dynamicReplacement(for: body) private var __preview__body: some View {
^
/Users/bazaroff/Desktop/BuildingListsAndNavigation/StartingPoint/Landmarks/Landmarks/LandmarkRow.swift:20:17: error: use of unresolved identifier 'LandmarkRow'
AnyView(LandmarkRow())
^~~~~~~~~~~