Python OOT module not showing up in GRC

Hi, 

I have followed Section 3.2 in the tutorial https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python to setup an OOT python block in GRC. 

I followed the instructions on a Linux machine running GNURadio 3.7 and it worked exactly as described. 

I then ran the tutorial on an NVIDIA Xavier Linux machine w/ GNURadio 3.8 and all the steps seemed to work. The QA test worked in python, and `cmake; make; sudo make install; sudo ldconfig` all ran without any errors. However, when I open GRC, I cannot see the block. 

I am wondering if this tutorial is not up-to-date w/ GNURadio 3.8 or if maybe there is something weird about the Xavier that is causing the bug. 

Let me know, 

Thanks!