This is a bit of an odd one but during the cloning of a hostgroup it seems that array/json class parameter overrides can become invalid.

Pre-req:
2 x environments with the same classes in both.
2 x identical hostgroups in different environments. Not sure if having classes in them is mandatory or not
1 x child hostgroup containing a class with an array-type override set.

Step to reproduce:
Clone the child hostgroup from one environment to the other, changing both the parent HG and environment fields during the clone process.

Expected:
HG should be cloned with override parameter kept.

Actual:
Parameter override values are cloned with additional escape sequences, causing them to fail validation. See attached.