diff --git a/android/assets/jsons/Civ V - Vanilla/TileImprovements.json b/android/assets/jsons/Civ V - Vanilla/TileImprovements.json
index aad3f03325..74ef97ee31 100644
--- a/android/assets/jsons/Civ V - Vanilla/TileImprovements.json	
+++ b/android/assets/jsons/Civ V - Vanilla/TileImprovements.json	
@@ -206,7 +206,7 @@
 		"uniqueTo": "Polynesia",
 		"culture": 1,
 		"turnsToBuild": 4,
-		"uniques": ["[+1 Culture] for each adjacent [Moai]", "Can only be built on Coastal tiles", "[+1 Gold] once [Flight] is discovered"],
+		"uniques": ["[+1 Culture] for each adjacent [Moai]", "Can only be built on [Coastal] tiles", "[+1 Gold] once [Flight] is discovered"],
 		"techRequired": "Construction",
 		"shortcutKey": "M"
 	},
@@ -216,7 +216,7 @@
 		"terrainsCanBeBuiltOn": ["Hill"],
 		"food": 1,
 		"turnsToBuild": 7,
-		"uniques": ["[+1 Food] for each adjacent [Mountain]", "Cannot be built on bonus resource",
+		"uniques": ["[+1 Food] for each adjacent [Mountain]", "Cannot be built on [Bonus resource] tiles",
 			"[+1 Food] on [Fresh water] tiles once [Civil Service] is discovered",
 			"[+1 Food] on [non-fresh water] tiles once [Fertilizer] is discovered"],
 		"techRequired": "Construction",
diff --git a/core/src/com/unciv/logic/map/TileInfo.kt b/core/src/com/unciv/logic/map/TileInfo.kt
index a6c537e431..2174f07431 100644
--- a/core/src/com/unciv/logic/map/TileInfo.kt
+++ b/core/src/com/unciv/logic/map/TileInfo.kt
@@ -397,8 +397,10 @@ open class TileInfo {
         return when {
             improvement.name == this.improvement -> false
             isCityCenter() -> false
-            "Cannot be built on bonus resource" in improvement.uniques && resource != null
+            // deprecated as of 3.15.15
+                "Cannot be built on bonus resource" in improvement.uniques && resource != null
                     && getTileResource().resourceType == ResourceType.Bonus -> false
+            //
             improvement.uniqueObjects.filter { it.placeholderText == "Cannot be built on [] tiles" }.any {
                     unique -> matchesTerrainFilter(unique.params[0])
             } -> false
@@ -425,10 +427,12 @@ open class TileInfo {
             topTerrain.unbuildable && !improvement.isAllowedOnFeature(topTerrain.name) -> false
             // DO NOT reverse this &&. isAdjacentToFreshwater() is a lazy which calls a function, and reversing it breaks the tests.
             improvement.hasUnique("Can also be built on tiles adjacent to fresh water") && isAdjacentToFreshwater -> true
-            "Can only be built on Coastal tiles" in improvement.uniques && isCoastalTile() -> true
-            improvement.uniqueObjects.filter { it.placeholderText == "Can only be built on [] tiles" }.any {
-                unique -> !matchesTerrainFilter(unique.params[0])
-            } -> false
+            // deprecated as of 3.15.15
+                "Can only be built on Coastal tiles" in improvement.uniques && isCoastalTile() -> true
+            //
+            improvement.uniqueObjects.filter { it.placeholderText == "Can only be built on [] tiles" }.all {
+                unique -> matchesTerrainFilter(unique.params[0])
+            } -> true
             else -> resourceIsVisible && getTileResource().improvement == improvement.name
         }
     }
@@ -462,11 +466,16 @@ open class TileInfo {
             else -> {
                 if (terrainFeatures.contains(filter)) return true
                 if (hasUnique(filter)) return true
+                // Resource type check is last - cannot succeed if no resource here
+                if (resource == null) return false
                 // Checks 'luxury resource', 'strategic resource' and 'bonus resource' - only those that are visible of course
-                if (observingCiv != null && hasViewableResource(observingCiv) 
-                    && getTileResource().resourceType.name + " resource" == filter) 
-                        return true
-                return false
+                // not using hasViewableResource as observingCiv is often not passed in,
+                // and we want to be able to at least test for non-strategic in that case.
+                val resourceObject = getTileResource()
+                if (resourceObject.resourceType.name + " resource" != filter) return false // filter match
+                if (resourceObject.revealedBy == null) return true  // no need for tech
+                if (observingCiv == null) return false  // can't check tech
+                return observingCiv.tech.isResearched(resourceObject.revealedBy!!)
             }
         }
     }
diff --git a/tests/src/com/unciv/logic/map/TileImprovementConstructionTests.kt b/tests/src/com/unciv/logic/map/TileImprovementConstructionTests.kt
index 70e9ebcc18..751ed1bcf1 100644
--- a/tests/src/com/unciv/logic/map/TileImprovementConstructionTests.kt
+++ b/tests/src/com/unciv/logic/map/TileImprovementConstructionTests.kt
@@ -82,7 +82,7 @@ class TileImprovementConstructionTests {
         map.tileMatrix.add(arrayListOf(tile, otherTile))
 
         for (improvement in ruleSet.tileImprovements.values) {
-            if (!improvement.uniques.contains("Can only be built on Coastal tiles")) continue
+            if (!improvement.uniques.contains("Can only be built on [Coastal] tiles")) continue
             civInfo.civName = improvement.uniqueTo ?: "OtherCiv"
             val canBeBuilt = tile.canBuildImprovement(improvement, civInfo)
             Assert.assertTrue(improvement.name, canBeBuilt)
@@ -100,4 +100,19 @@ class TileImprovementConstructionTests {
             Assert.assertFalse(improvement.name, canBeBuilt)
         }
     }
+
+    @Test
+    fun terraceFarmCanNOTBeBuiltOnBonus() {
+        tile.baseTerrain = "Plains"
+        tile.terrainFeatures.add("Hill")
+        tile.resource = "Sheep"
+        tile.setTransients()
+        civInfo.civName = "Inca"
+
+        for (improvement in ruleSet.tileImprovements.values) {
+            if (!improvement.uniques.contains("Cannot be built on [Bonus resource] tiles")) continue
+            val canBeBuilt = tile.canBuildImprovement(improvement, civInfo)
+            Assert.assertFalse(improvement.name, canBeBuilt)
+        }
+    }
 }
\ No newline at end of file