Hang on... I got trapped in the nether, and on my long trip back to the original portal location see detail's of what happened here: 

1. MCPE-115933

I come across a natural strider with a saddle on him in a survival only game play world, and I did not even have a saddle in the nether so how did he just spawn in with a saddle? Is this a glitch or a feature?! I can show you the picture I took. I did not have a saddle in the nether, but the strider clearly had a saddle on it and it spawned naturally like that. Tell me is this a glitch or a feature. If that's a feature then its new to me. If that's a glitch then it dose not seem too hard to fix. XD best o luck!