[MCPE-63713] No end portal

Every stronghold I find in multiple maps never have end portals, I even dig into walls and spend at least an hour looking. I never find them anymore, on pocket edition either.

Description Update

Stronghold generation appears to have changed between 1.14 and 1.15 resulting in a lack of portal rooms or libraries.

What I expected to happen was...:
Standard stronghold with a portal room.

What actually happened was...:
Stronghold was malformed with no portal rooms or libraries

Steps to Reproduce:
1. Load seed 499419684 in 1.14.
2. Portal located at -321 49 -709.
3. Load same seen in 1.15 note portal no longer present. Also note the significant change in generation.
4. I tried 7 randomly generated seeds and none had portal rooms or libraries.