Fix bug where multiple propertysets were sharing the same properties

Author: felipemanga

src/common/PropertySet.hpp

@@ -99,8 +99,13 @@ class PropertySet {
  }
 
  void append(const PropertySet& other) {
- for (auto& entry : other.properties) {
- properties.insert_or_assign(entry.first, entry.second);
+ for (auto& [key, value] : other.properties) {
+ auto it = properties.find(key);
+ if (it == properties.end()) {
+ properties.insert({key, std::make_shared<Value>(*value)});
+ } else {
+ *it->second = *value;
+ }
  }
  }