What
Upgrade planner should apply to the ghosts of destroyed entities.Why
When repairing a remote part of the factory after it got attacked, not having the same tier of belts (like you use blue everywhere except this mine is old so is red belted) leads to headaches. Same problem for assemblers or inserters in train based bases, etc.I understand why ghost entities from blueprints aren't upgrade-able : this encourages the player to make clean and updated blueprints. But destroyed entities aren't here by the player will, so imo they need a tiny different behavior like the one mentioned here.
(didn't find a similar topic but it might exist)