[PHP 8.2] Access to an undefined property in CRM_Contribute_Form_Contribution_Confirm

I tried to add the info to this report:

➜  civicrm-core (2b6d15a4629bff5922f35f33ce15e909ff633666) phpstan analyse -l 0 CRM/Contribute/Form/Contribution/Confirm.php 

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  Line   CRM/Contribute/Form/Contribution/Confirm.php                                                                                                                    
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  270    Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  489    Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  554    Access to an undefined property object::$_membershipBlock.                                                                     
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  704    Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_membershipTypeValues.                              
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  1485   Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  2290   Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  2301   Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
  2478   Access to an undefined property CRM_Contribute_Form_Contribution_Confirm::$_lineItem.                                          
         💡 Learn more: https://phpstan.org/blog/solving-phpstan-access-to-undefined-property                                            
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Related: #4072 (closed)