In products.index.inc.php, near line 216, when processing POST['option_add'], the matrix_include, set_enabled, and absolute_price keys are not present if those checkboxes are not checked when saving the form. (Maybe not for set_enabled - that's a weird checkbox.)
Suggest doing the same as was done for option_negative and option_default.
As per PHP8:
In products.index.inc.php, near line 216, when processing
POST['option_add'], thematrix_include,set_enabled, andabsolute_pricekeys are not present if those checkboxes are not checked when saving the form. (Maybe not forset_enabled- that's a weird checkbox.)Suggest doing the same as was done for
option_negativeandoption_default.