Arduino IDE does not display examples folder from my custom library
Your library.properties is lacking a line.  Emulating your library with blank files and copying in your library.properties content, and running on Linux from the command line, it reports to me:

Invalid library found in /home/matt/Arduino/libraries/ABC_Node: Missing 'url' from library


So you lack the line:

url=https://whatever.website.you.want.to/point.to


(Or use something like http://example.com if you don't want one...)

I put that line in, and magically the library appears in the list.