From Kodak Alaris, "We've recently become aware of complaints for inactive development, [with] 2019/08/09 date coded KODAK PROFESSIONAL XTOL Developer."
"If you have a problem, please contact them at ProPaperChem@kodakalaris.com."
For now, check the date on your packets of XTOL developer. Until further details are released, hold on to the developer, but avoid using it if date coded 2019/08/09.