This is also broken in 28.0.2. Unfortunately, this isn't hot fixable.
I've attached a macro which toggles this setting such that the new setting gets saved.
Load the attached macro module (Macro>Load Module...) and invoke the macro command "toggle_cr_without_lf_erases_line" on the SlickEdit command line. You can use the options dialog to show you the new value but don't change it there. Just use the "toggle_cr_without_lf_erases_line" command.