diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/options.json b/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/options.json
index 26f2ddc95852..25a0eb9883c4 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/options.json
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/options.json
@@ -1,6 +1,6 @@
 {
   "plugins": [
-    "proposal-logical-assignment-operators",
-    "proposal-class-properties"
+    ["proposal-logical-assignment-operators", { "loose": true }],
+    ["proposal-class-properties", { "loose": true }]
   ]
 }
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/output.js
index 1bdf252c9349..e7d19cbdcdf6 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/output.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/private-loose/logical-assignment/output.js
@@ -1,26 +1,26 @@
-function _classPrivateFieldSet(receiver, privateMap, value) { var descriptor = privateMap.get(receiver); if (!descriptor) { throw new TypeError("attempted to set private field on non-instance"); } if (descriptor.set) { descriptor.set.call(receiver, value); } else { if (!descriptor.writable) { throw new TypeError("attempted to set read only private field"); } descriptor.value = value; } return value; }
+function _classPrivateFieldLooseBase(receiver, privateKey) { if (!Object.prototype.hasOwnProperty.call(receiver, privateKey)) { throw new TypeError("attempted to use private field on non-instance"); } return receiver; }
 
-function _classPrivateFieldGet(receiver, privateMap) { var descriptor = privateMap.get(receiver); if (!descriptor) { throw new TypeError("attempted to get private field on non-instance"); } if (descriptor.get) { return descriptor.get.call(receiver); } return descriptor.value; }
+var id = 0;
 
-var _nullish = new WeakMap();
+function _classPrivateFieldLooseKey(name) { return "__private_" + id++ + "_" + name; }
 
-var _and = new WeakMap();
+var _nullish = _classPrivateFieldLooseKey("nullish");
 
-var _or = new WeakMap();
+var _and = _classPrivateFieldLooseKey("and");
+
+var _or = _classPrivateFieldLooseKey("or");
 
 class Foo {
   constructor() {
-    _nullish.set(this, {
+    Object.defineProperty(this, _nullish, {
       writable: true,
       value: 0
     });
-
-    _and.set(this, {
+    Object.defineProperty(this, _and, {
       writable: true,
       value: 0
     });
-
-    _or.set(this, {
+    Object.defineProperty(this, _or, {
       writable: true,
       value: 0
     });
@@ -31,12 +31,12 @@ class Foo {
   }
 
   test() {
-    var _this$self;
+    var _classPrivateFieldLoo, _classPrivateFieldLoo2, _classPrivateFieldLoo3, _classPrivateFieldLoo4;
 
-    _classPrivateFieldGet(this, _nullish) ?? _classPrivateFieldSet(this, _nullish, 42);
-    _classPrivateFieldGet(this, _and) && _classPrivateFieldSet(this, _and, 0);
-    _classPrivateFieldGet(this, _or) || _classPrivateFieldSet(this, _or, 0);
-    _classPrivateFieldGet(_this$self, _nullish) ?? _classPrivateFieldSet(_this$self = this.self(), _nullish, 42);
+    (_classPrivateFieldLoo = _classPrivateFieldLooseBase(this, _nullish))[_nullish] ?? (_classPrivateFieldLoo[_nullish] = 42);
+    (_classPrivateFieldLoo2 = _classPrivateFieldLooseBase(this, _and))[_and] && (_classPrivateFieldLoo2[_and] = 0);
+    (_classPrivateFieldLoo3 = _classPrivateFieldLooseBase(this, _or))[_or] || (_classPrivateFieldLoo3[_or] = 0);
+    (_classPrivateFieldLoo4 = _classPrivateFieldLooseBase(this.self(), _nullish))[_nullish] ?? (_classPrivateFieldLoo4[_nullish] = 42);
   }
 
 }
diff --git a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/logical-assignment/output.js b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/logical-assignment/output.js
index 1bdf252c9349..0ae51ebc8087 100644
--- a/packages/babel-plugin-proposal-class-properties/test/fixtures/private/logical-assignment/output.js
+++ b/packages/babel-plugin-proposal-class-properties/test/fixtures/private/logical-assignment/output.js
@@ -36,7 +36,7 @@ class Foo {
     _classPrivateFieldGet(this, _nullish) ?? _classPrivateFieldSet(this, _nullish, 42);
     _classPrivateFieldGet(this, _and) && _classPrivateFieldSet(this, _and, 0);
     _classPrivateFieldGet(this, _or) || _classPrivateFieldSet(this, _or, 0);
-    _classPrivateFieldGet(_this$self, _nullish) ?? _classPrivateFieldSet(_this$self = this.self(), _nullish, 42);
+    _classPrivateFieldGet(_this$self = this.self(), _nullish) ?? _classPrivateFieldSet(_this$self, _nullish, 42);
   }
 
 }