I am actually developing an android application (min api:15, target api: 23). My problem is, that fatal exceptions are not shown in the logcat of the android studio. I have:
Object o = null;
I believe it is something with the way you are writing your log. I am not sure what you have set TAG to but I would also try writing...
Then search your logcat for "Fatal" and it should bring you to your tag.
The only other thing I would say it could be is the device itself. I am able to see fatal errors on both a virtual 6.0 and on a physical device which is a Samsung. I would try to do a factory reset on the device. Just make sure you have anything saved that you need as it will wipe everything. Reset a Huawei P8 Lite