Property placeholders aren't resolved when configuration property binding creates a Map from a property value using a converter #39471
Description
When trying to fill an object that implements Map but is valued by a single property via a converter, the MapBinder class does not use a PlaceholderResolver after retrieving the property value. It can be seen in the method bindAggregate.
This result in placeholder not being resolved in the property.
The usecase seems strange, but this is the solution I find to allow multiple way of filing a pseudo Map object from either sub properties or a legacy string format.