Tracerestrict: Fix non-deterministic use of _sorted_cargo_specs

src/core/bitmath_func.cpp

@@ -53,6 +53,13 @@ uint8 FindFirstBit(uint32 x)
 	return pos;
 }
 
+uint8 FindFirstBit64(uint64 x)
+{
+	if (x == 0) return 0;
+	if ((x & 0x00000000ffffffffULL) != 0) return FindFirstBit(x);
+	return FindFirstBit(x >> 32) + 32;
+}
+
 /**
  * Search the last set bit in a 64 bit variable.
  *

src/tracerestrict.cpp

@@ -630,8 +630,8 @@ void SetTraceRestrictValueDefault(TraceRestrictItem &item, TraceRestrictValueTyp
 			break;
 
 		case TRVT_CARGO_ID:
-			assert(_sorted_standard_cargo_specs_size > 0);
-			SetTraceRestrictValue(item, _sorted_cargo_specs[0]->Index());
+			assert(_standard_cargo_mask != 0);
+			SetTraceRestrictValue(item, FindFirstBit64(_standard_cargo_mask));
 			SetTraceRestrictAuxField(item, 0);
 			break;