AFAIK, latest APP SDK 3.0 Beta includes version 1.2.5. Can not comment about the timeline when support will be added for 1.2.6
Thanks for answer.
Yes, my mistake. 2.9 includes 1.2.4, 2.9.1 and 3.0 Beta include version 1.2.5. FYI everything works when using APP SDK 2.9.1 with cl.hpp 1.2.6 version.