Hoppers that are 1 or 2 blocks away (can vary) from some chunk edge simply do not suck elements (if you use an items separator based on compressed ice and slime pistons).
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[Mod] OcelotOnesie
Yellow_py
Thank you for your report!
We're tracking this issue in MCPE-99462, so this ticket is being resolved and linked 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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