@gonzalonal I've done all of my test on a custom ATMEGA328p shield for BeagleBone Black, running OH2 (beta) so the environment is the same but I've not the reset circuit that gives the issue above. So now I'll push this little fix on the github repo, I think there's nothing to to in this sense. Thank for your time !
If you find some other strange behaviour also remember that github repo has it's own issue tracker available here: https://github.com/tobof/openhab2-addons/issues, it works very well and is the best place to keep track of every software-releated bug
Greetings!