'pcs ungroup' command removed location constraint

Issue

While removing a resource from resource group, the pcs command also removes all the constraints configured on resource group. Below are the steps leading to this issue:

• There was a resource group group1 with two resources:

  $ pcs status
  Full list of resources:
  [...]
   Resource Group: group1
       lv1    (ocf::heartbeat:LVM):       Started node1.example.com 
       vip    (ocf::heartbeat:IPaddr2):   Started node1.example.com 
  

• And below location constraints were configured for above resource group:

  $ pcs constraint show --full
  Location Constraints:
    Resource: group1                   <<-----
      Enabled on: node1.example.com (score:1000) (id:location-group1-node1.example.com-1000)
      Enabled on: node2.example.com (score:500) (id:location-group1-node2.example.com-500)
    Resource: lv1
      Enabled on: node1.example.com (score:INFINITY) (role: Started) (id:cli-prefer-lv1)
    Resource: vip
      Enabled on: node1.example.com (score:INFINITY) (role: Started) (id:cli-prefer-vip)
  

• When a resource is moved out of resource group using pcs resource ungroup or pcs resource group remove command, it removes all location constraints configurd for resource group group1:

  $ pcs resource ungroup group1 lv1
  Removing Constraint - location-group1-node1.example.com-1000
  Removing Constraint - location-group1-node2.example.com-500
  $ 
  
  $ pcs constraint show --full
  Location Constraints:
    Resource: lv1
      Enabled on: node1.example.com (score:INFINITY) (role: Started) (id:cli-prefer-lv1)
    Resource: vip
      Enabled on: node1.example.com (score:INFINITY) (role: Started) (id:cli-prefer-vip)
  [...]