When I throw some sweet berries to a fox, they disappear immediately without showing up in the foxes' mouth. Then I tried some cobblestone, they disappear in the same visual effects.
And so do torches, and some other objects. They never shows up as if the fox picks up no more but just consume them directly.
Thank you for your report!
We're actually already tracking this issue at MCPE-69798, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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