When making a end portal identical to the ones in strongholds, and filling it with eyes, a portal is not created, and the middle stays empty.
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Nope, you still messed it up. For correct orientation place the ender portal frames so they are facing the inside of the portal. They face the player when you place them, so you can just place the 12 frames around you.
However, you don't even need to orient them all correctly. Only the last placed eye needs to be in an ender portal frame facing the inside. The other frames just need to be in the right position.
Not a bug. The portal frame blocks in your screenshot are orientated wrongly.