How to get this bug
1.in your creative world type /give playername 119 1
2. place the end portal somewhere
3. break and you'll see
4. watch the block in your inventory
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I think it's work as intented.
Its intended that the end portal looks like the nether portal? I don’t think so.

Confirmed.
I don't know, it was implemented on 1.5, so I don't know, maybe they gave it a temporal texture.
This still affects 1.7.4/5. However, in 1.8 snapshots, they have lava breaking particles and "missing" texture in inventory (see: MC-48102). We can say that this is "fixed" in 08a.

Not fixed, but superseded by MC-48102
just give yourself a end portal block (id 119), see the animation in your inventory, place it, break it, and see the particles