The height of the over world is 256 but the height limit in nether is still 128.
Linked issues
Comments
[Mojang] Mega_Spud (Jay)
MCPE-18709
Height limit is wrong in neither
Resolved
Duplicate
0
[Mojang] Mega_Spud (Jay)
migrated
(Unassigned)
Unconfirmed
Tablet - Android - Samsung Galaxy Tab 4 Nook
Android 4.0
0.17.0.2
Retrieved
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However, this issue has been closed as a Duplicate of MCPE-18263.
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