[MCPE-174856] /fill command not working properly

the /fill command does not work below y=0 and gives the error message "cannot place blocks outside the world"

Linked issues

Duplicate of MCPE-154009

Benedictnewman please state the full command you entered and your coordinates in the world at that moment.

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We're tracking this issue in MCPE-154009, so this ticket is being resolved and linked as a duplicate.

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