Slimes Spawning in portals

Did you actually visually observe a slime spawn on top of the bottom two obsidian blocks and then disappear into the Nether?

No, but there are no other spaces for the slimes to spawn. They keep teleporting from my gold farm, which 100% of the possible spawning spaces are portals, and from building it I know that some of the portals were in a slime chunk

Would it be possible for you to post a screenshot of the portal and the surrounding environment the Slimes seem to been traveling through? I'm just a little confused about the part where there are "no other spaces" in which they can spawn. Thanks!

You can also attach your worldsave, if you think that will get this bug fixed sooner.

I have attached a screenshot of my gold farm layout. I couldn't attach a worldsave because the file size is too big.

(ps I have a feeling that the portal blocks have the same spawning mechanic as string)

Use Dropbox or mediafire to upload your world then put down the link

http://www.mediafire.com/download/auvtd3rkydhazci/Minecraft+World.zip
Heres the link to the world download. Coords are:
-810 17 692

Is this still an issue in the current Minecraft Snapshot 15w46a or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.