Ampersand reference appears to be treated as sp_arith after a cast to a custom type

[AnthonySWest]

Uncrustify version 0.78.1 (also occurs in latest commit for the master branch - 42cbc77).

Use the default config settings, but set sp_arith to force.

A space is added after the reference (&) when it follows a cast, and when the cast is a custom type (not int, double, etc.). It appears to be incorrectly treated as sp_arith.

Expected results:

bool AddEventToList(TEvent event)
{
  EventList->Add((TEvent) &event);
  EventList->Add((int) &event);
  EventList->Add((TEvent) (&event));
  EventList->Add((TEvent*) &event);
}

Actual results:

bool AddEventToList(TEvent event)
{
  EventList->Add((TEvent) & event); // unexpected space after ampersand
  EventList->Add((int) &event);
  EventList->Add((TEvent) (&event)); // wrapping inside parens is a workaround.
  EventList->Add((TEvent*) &event); // if the cast is a pointer, works
}