Steps to reproduce the issue

Every time that you call: $session = JFactory::getSession()->getData();

• you get 2 duplicate queries to DB tables: __users , __usergroups

just enable debug plugin and look at the duplicate queries to DB tables: __users , __usergroups

Expected result

No duplicate queries when calling:
JSession::getData()

Actual result

Duplicate queries because current user is loaded again ...

JSessiongetData uses clone() to return $this->data, thus you get

JSession::getData()
clone($this->data)
unserialize(...)
JUser::__wakeup()
...
JTable::load(...) // So currrent user is loaded again

System information (as much as possible)

J3.8.8

Additional comments

Related PR was #20697 , but probably was wrong way to fix this

@mbabker , i closed the other PR as it was probably wrong way to address this, and instead i have opened this issue