Will a trophy 'trigger' done on another platform make it so the trophy is not possible to get on PS4?
In a quick version yes, all trophies auto pop and they added a platinum trophy to PS5 version. Note – This game has also been confirmed to auto pop the PS4 100% if you played the PS5 version first. This is done through the in-game log-in account system, which means you can transfer progress from PC, XBox, mobile etc. and still pop trophies.