Noticed it whilest exploring :
1. Download 17w46a
2. Generate a normal world with the seed 17w46a
3. Go to -51 50 2511 and see for yourself
Environment
Windows 10 Insider build 17035, using the Java runtime provided with Minecraft
MC-121979
End portal generates with no placed ender eyes
Resolved
Works As Intended
0
Chances exist, there was never a guarantee for an eye.