diff --git a/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs b/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
index 43a33c5d3e..fb03a1034b 100644
--- a/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
+++ b/common/cosmwasm-smart-contracts/mixnet-contract/src/mixnode.rs
@@ -17,6 +17,7 @@ use crate::{
 use cosmwasm_schema::cw_serde;
 use cosmwasm_std::{Addr, Coin, Decimal, StdResult, Uint128};
 use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
 use serde_repr::{Deserialize_repr, Serialize_repr};
 
 /// Full details associated with given mixnode.
@@ -647,14 +648,39 @@ impl From<LegacyMixLayer> for u8 {
         export_to = "ts-packages/types/src/types/rust/PendingMixnodeChanges.ts"
     )
 )]
-#[cw_serde]
-#[derive(Default, Copy)]
+// note: we had to remove `#[cw_serde]` as it enforces `#[serde(deny_unknown_fields)]` which we do not want
+// with the addition of  .cost_params_change field
+#[derive(
+    ::cosmwasm_schema::serde::Serialize,
+    ::cosmwasm_schema::serde::Deserialize,
+    ::std::clone::Clone,
+    ::std::fmt::Debug,
+    ::std::cmp::PartialEq,
+    ::cosmwasm_schema::schemars::JsonSchema,
+    Default,
+    Copy,
+)]
+#[schemars(crate = "::cosmwasm_schema::schemars")]
 pub struct PendingMixNodeChanges {
     pub pledge_change: Option<EpochEventId>,
+
     #[serde(default)]
     pub cost_params_change: Option<IntervalEventId>,
 }
 
+#[derive(Default, Copy, Clone, Debug, Serialize, Deserialize, JsonSchema)]
+pub struct LegacyPendingMixNodeChanges {
+    pub pledge_change: Option<EpochEventId>,
+}
+
+impl From<PendingMixNodeChanges> for LegacyPendingMixNodeChanges {
+    fn from(value: PendingMixNodeChanges) -> Self {
+        LegacyPendingMixNodeChanges {
+            pledge_change: value.pledge_change,
+        }
+    }
+}
+
 impl PendingMixNodeChanges {
     pub fn new_empty() -> PendingMixNodeChanges {
         PendingMixNodeChanges {
diff --git a/nym-api/nym-api-requests/src/legacy.rs b/nym-api/nym-api-requests/src/legacy.rs
index f7af56252c..f0810ffa8e 100644
--- a/nym-api/nym-api-requests/src/legacy.rs
+++ b/nym-api/nym-api-requests/src/legacy.rs
@@ -2,10 +2,8 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 use cosmwasm_std::Decimal;
-use nym_mixnet_contract_common::mixnode::PendingMixNodeChanges;
-use nym_mixnet_contract_common::{
-    GatewayBond, LegacyMixLayer, MixNodeBond, MixNodeDetails, NodeId, NodeRewarding,
-};
+use nym_mixnet_contract_common::mixnode::LegacyPendingMixNodeChanges;
+use nym_mixnet_contract_common::{GatewayBond, LegacyMixLayer, MixNodeBond, NodeId, NodeRewarding};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::ops::Deref;
@@ -64,7 +62,7 @@ pub struct LegacyMixNodeDetailsWithLayer {
 
     /// Adjustments to the mixnode that are ought to happen during future epoch transitions.
     #[serde(default)]
-    pub pending_changes: PendingMixNodeChanges,
+    pub pending_changes: LegacyPendingMixNodeChanges,
 }
 
 impl LegacyMixNodeDetailsWithLayer {
@@ -80,13 +78,3 @@ impl LegacyMixNodeDetailsWithLayer {
         self.bond_information.is_unbonding
     }
 }
-
-impl From<LegacyMixNodeDetailsWithLayer> for MixNodeDetails {
-    fn from(value: LegacyMixNodeDetailsWithLayer) -> Self {
-        MixNodeDetails {
-            bond_information: value.bond_information.into(),
-            rewarding_details: value.rewarding_details,
-            pending_changes: value.pending_changes,
-        }
-    }
-}
diff --git a/nym-api/src/nym_contract_cache/cache/refresher.rs b/nym-api/src/nym_contract_cache/cache/refresher.rs
index 0e9e6f45f9..badf0e2344 100644
--- a/nym-api/src/nym_contract_cache/cache/refresher.rs
+++ b/nym-api/src/nym_contract_cache/cache/refresher.rs
@@ -173,7 +173,7 @@ impl NymContractCacheRefresher {
                     layer,
                 },
                 rewarding_details: detail.rewarding_details,
-                pending_changes: detail.pending_changes,
+                pending_changes: detail.pending_changes.into(),
             })
         }