My issue here was wrongfully closed the bed model no longer supports railing like it use to with it being in block form you could add railings below it now it isn't possible.
IT DOESN'T WORK AS INTENDED IT WAS REMOVED only in 1.12 use to work in 1.8 java edition and currently works as windows 10 edition
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did you even ask if it was intentional no you just assume that it works as intended unless you can't 100% deny it you assume it's not a bug nor issue. that's not how issues work someone reports an issue you don't work on how to deny it you work on ok what's the issue here and how do I fix it. It's not like I reported sheep no longer drop wool when punched. This is a feature that was intended on being there and got accidentally removed just like the bed model ability
I didn't see in the 1.12 change log warning crappy new features added no new ability to add a bed model and no new ability to add bed railings so it's not a feature that was removed nor intended.
It is currently possible with windows 10 and every version under 1.12.You can't tell me that it was purposely removed the ability for a texture ability when it's in every single other version of the game and windows 10 edition and xbox edition

Your first point: not true; this was a quite clear change in model and design.
Your second point: that it’s not in the changelog does not mean it’s unintentional, for example, soul sand creating upwards bubble columns was not mentioned, yet it’s intentional.
Your third point: things change. And you should not be comparing the game versions (bedrock, console, java) in such a manor, for example, java has (intentionally implemented) quasi connectivity, bedrock does not; and both are intended implementations.
That it's no longer possible doesn't mean it's unintentional.