This is minor in the scheme of things but …
If I am editing Component PHP / HTML code (using Nova) in my DevPack and add in new @if | @else | @endif … statements, then when I save the Component DevPack PHP code, Elements doesn’t always action the @ commands but it will take any code PHP / HTML updates I have done and reflect these in the Elements Editor. This can be and is confusing! 
The sort of code I am referring to is like this:
@if(!edit)
value="<?= htmlspecialchars($value) ?>" readonly>
@else
value="Metadata will be here." readonly>
@endif
In the above example, I am changing the Edit output so that PHP code (which the Editor doesn’t action) is hidden in the Editor and gives the user more useful output.
I have found a work-around method is to save the PHP / HTML code and then change to a different webpage (i.e. not the one with the custom Component I am changing) and then go back again and then the update is taken.