Did you check the attributes exist in the mesh match those in the shader file? ie grab the mesh of your bone rigged object into a memblock, get the attribute list, find the bone shader file(there are 2 but both have same attributes so choose either) then look for the word attribute and compare the attributes from the mesh to those in the shader file to ensure they match. If this does not sound familiar you should read the relevant parts of the help files. Likewise you should ensure that the textures are applied to the correct texture stages. Often things disappear when things have not been set up correctly where shaders are concerned. I can only hazard a guess at this point that you might be missing bone indices.
There is a PBR demo that comes with agk studio though things are not dynamic but baked.
There is a bloom shader in your projects folder that comes with both versions of agk.
Blender was never built with any TGC product in mind, the two are not compatible in terms of shaders as they are more often than not(in the past at least) built for the engine, Blender has its own game engine. If it is bone indices that are the issue then I cannot say I know how to add them inn blender...to put it simply I have not tried.
We often consider "game makers" as things like game guru or fpsc, ie point n click drag n drop style editor, agk is a B.A.S.I.C language and its capabilities are limited to OGL 2(though think its not 100% implemented but 1.1 is?), so anything vulkan is set to those limits too - at least as far as I know...someone might wanna jump in here with the exact info relating to this area, on steam the min spec is stated as an OpenGL 2.0 capable card is required. That is not to say that "game maker" is some industry term, idk, I simply picked that up from reading these forums. So in terms of should we not have better...well when we purchase the product it is best to pay attention to what it says its limits are. Not saying there is no chance of better capabilities, however it has always seemed unlikely, ultimately it is up to TGC.
Now I just mentioned vulkan, however you have posted this on the classic board - classic does not have vulkan, only studio has. On Your other thread you said at first you fixed your issue by using vulkan, so you must already own studio so you already have the PBR demo installed.
There is little point begging TGC on here, I don't really ever see any of them on here other than the update threads and even then it can be long periods of time between visits.
Win 10 Home 64, Intel(R) Core(TM) i5-10300H, 8GB DDR4, NVidia GeForce GTX 1650 4GB GDDR6