diff --git a/eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/NMSFastItemStack.kt b/eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/NMSFastItemStack.kt
index ab2e2442..0476ffe3 100644
--- a/eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/NMSFastItemStack.kt
+++ b/eco-core/core-nms/v1_16_R3/src/main/kotlin/com/willfp/eco/proxy/v1_16_R3/fast/NMSFastItemStack.kt
@@ -101,12 +101,16 @@ class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemS
         for (flag in hideFlags) {
             this.flagBits = this.flagBits or getBitModifier(flag)
         }
+
+        apply()
     }
 
     override fun removeItemFlags(vararg hideFlags: ItemFlag) {
         for (flag in hideFlags) {
             this.flagBits = this.flagBits and getBitModifier(flag)
         }
+
+        apply()
     }
 
     override fun getItemFlags(): MutableSet<ItemFlag> {
diff --git a/eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/NMSFastItemStack.kt b/eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/NMSFastItemStack.kt
index 03c93e8d..107fa355 100644
--- a/eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/NMSFastItemStack.kt
+++ b/eco-core/core-nms/v1_17_R1/src/main/kotlin/com/willfp/eco/proxy/v1_17_R1/fast/NMSFastItemStack.kt
@@ -120,12 +120,16 @@ class NMSFastItemStack(itemStack: org.bukkit.inventory.ItemStack) : EcoFastItemS
         for (flag in hideFlags) {
             this.flagBits = this.flagBits or getBitModifier(flag)
         }
+
+        apply()
     }
 
     override fun removeItemFlags(vararg hideFlags: ItemFlag) {
         for (flag in hideFlags) {
             this.flagBits = this.flagBits and getBitModifier(flag)
         }
+
+        apply()
     }
 
     override fun getItemFlags(): MutableSet<ItemFlag> {