Awesome game but maybe with one wrong rule in the app – Le Havre (The Harbor) Review

Really like this game and I am impressed that he team can put so many info on a tiny phone screen, good job. However, my understanding of the rules is the you can purchase/sale building at any time during your term; however, when you are using the “construction building (8)” in the app to build 2 proposals, it seems you are not allowed to build one first, buy the 2nd underneath, and then build the 3rd card. The app doesn’t show the function and indicates that you can’t take those actions while entering a building. Please clarify and fix. Thanks!
Review by Jay1khbtfvol on Le Havre (The Harbor).