the current version available via dashboard/apt-get is version 0.0.3 as the next version as yet to propagate there. In other words, your issue exist in that older version.
If you'd like, you may roll onto the next one by running:
sudo apt-get remove python-pantilthat python3-pantilthat
sudo pip install pantilthat && sudo pip3 install pantilthat
That said, without knowing exactly which neopixels you are using if is a hard one to assess, do you have a part number of a shop link that we could check out?