Android - unload/reloading textures result in black rectangles instead of text

The discussion started here: http://forum.openframeworks.cc/t/android-unload-reloading-textures-result-in-black-rectangles-instead-of-text/18038

Text on native UI elements turns to black rectangles after minimizing and restoring. See attached screenshots. It's directly related to loading/unloading textures in of, but I'm not sure how.
I've managed of creating a super simple reproduction based on "android empty example" that shows the problem!

The issue is reproduced on ALL Android phones I tried, with different OS versions.

The forum post has an attachment of an extremely simple reproduction project. Even though it's only a few lines of code, I couldn't figure out what (if at all) I'm doing wrong, and it's hard for me to understand what's going on inside (since I cannot debug it).

So I'm suspecting a bug related to how of unload/reloads the textures.

Thanks.

Start by running the attached reproduction project based on the Android empty example and compare behavior before and after minimizing and restoring. Read the linked forum discussion for the reproduction details, then trace the texture loading and unloading behavior involved in native UI text. Done means the reproduction no longer shows black rectangles after reload on Android.