diff --git a/src/table/newgrf_debug_data.h b/src/table/newgrf_debug_data.h
index c11ee335e0..ee29db8abf 100644
--- a/src/table/newgrf_debug_data.h
+++ b/src/table/newgrf_debug_data.h
@@ -2207,6 +2207,7 @@ class NIHTraceRestrict : public NIHelper {
 		CA(TRAIN_NOT_STUCK)
 		CA(CHANGE_COUNTER)
 		CA(NO_PBS_BACK_PENALTY)
+		CA(SLOT_CONDITIONALS)
 		CA(SPEED_ADAPTATION)
 		CA(PBS_RES_END_SIMULATE)
 		CA(RESERVE_THROUGH_ALWAYS)
diff --git a/src/tracerestrict.cpp b/src/tracerestrict.cpp
index 8ccd5ce67f..70e649c105 100644
--- a/src/tracerestrict.cpp
+++ b/src/tracerestrict.cpp
@@ -1286,6 +1286,7 @@ CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem>
 
 				case TRIT_COND_TRAIN_IN_SLOT:
 				case TRIT_COND_SLOT_OCCUPANCY:
+					actions_used_flags |= TRPAUF_SLOT_CONDITIONALS;
 					if (find_index(pbs_res_end_released_slots, GetTraceRestrictValue(item)) >= 0 || find_index(pbs_res_end_acquired_slots, GetTraceRestrictValue(item)) >= 0) {
 						actions_used_flags |= TRPAUF_PBS_RES_END_SIMULATE;
 					}
@@ -1350,7 +1351,7 @@ CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem>
 				case TRIT_SLOT:
 					switch (static_cast<TraceRestrictSlotCondOpField>(GetTraceRestrictCondOp(item))) {
 						case TRSCOF_ACQUIRE_WAIT:
-							actions_used_flags |= TRPAUF_SLOT_ACQUIRE | TRPAUF_WAIT_AT_PBS;
+							actions_used_flags |= TRPAUF_SLOT_ACQUIRE | TRPAUF_SLOT_CONDITIONALS | TRPAUF_WAIT_AT_PBS;
 							break;
 
 						case TRSCOF_ACQUIRE_TRY:
@@ -1367,7 +1368,7 @@ CommandCost TraceRestrictProgram::Validate(const std::vector<TraceRestrictItem>
 							break;
 
 						case TRSCOF_PBS_RES_END_ACQ_WAIT:
-							actions_used_flags |= TRPAUF_PBS_RES_END_SLOT | TRPAUF_PBS_RES_END_WAIT;
+							actions_used_flags |= TRPAUF_PBS_RES_END_SLOT | TRPAUF_PBS_RES_END_WAIT | TRPAUF_SLOT_CONDITIONALS ;
 							if (find_index(pbs_res_end_released_slots, GetTraceRestrictValue(item)) >= 0) actions_used_flags |= TRPAUF_PBS_RES_END_SIMULATE;
 							include(pbs_res_end_acquired_slots, GetTraceRestrictValue(item));
 							break;
diff --git a/src/tracerestrict.h b/src/tracerestrict.h
index eb794b9c3a..676262ca5d 100644
--- a/src/tracerestrict.h
+++ b/src/tracerestrict.h
@@ -470,6 +470,7 @@ enum TraceRestrictProgramActionsUsedFlags {
 	TRPAUF_TRAIN_NOT_STUCK        = 1 << 11, ///< Train is not stuck
 	TRPAUF_CHANGE_COUNTER         = 1 << 12, ///< Change counter value is present
 	TRPAUF_NO_PBS_BACK_PENALTY    = 1 << 13, ///< No PBS back penalty is present
+	TRPAUF_SLOT_CONDITIONALS      = 1 << 14, ///< Slot conditionals are present
 	TRPAUF_SPEED_ADAPTATION       = 1 << 15, ///< Speed adaptation control
 	TRPAUF_PBS_RES_END_SIMULATE   = 1 << 16, ///< PBS reservations ending at this signal slot changes must be fully simulated in dry run mode
 	TRPAUF_RESERVE_THROUGH_ALWAYS = 1 << 17, ///< Reserve through action is unconditionally set