Hello,
Thank you for making a bug report!
I believe this is a duplicate of this issue: Blue-Eyes Abyss Dragon's special summoning effects don't activate - #2 by DarkDove3
Please read through this post as to why I believe that this is working as intended.
It is important to include a replay code so that we can confirm whether or not this is the case or not.
In short, you must have a Blue eyes white dragon on your field, or in your graveyard at the time you wish you activate Abyss’ effect. It is written as such at the end of the cards effect.
If you have any other scenarios you believe to be bugs, please feel free to open up a new thread and include a replay so that we can verify the presence of any bug.
Thank you for helping to make Omega the best it can be!