After you have typed something in a sign, it doesn't allow you to go to the next line. I have the same problem on all the devices I've tried this on...
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[Mojang] Mega_Spud (Jay)
MCPE-20849
Signs don't type properly
Resolved
Duplicate
0
[Mojang] Mega_Spud (Jay)
migrated
(Unassigned)
Unconfirmed
Tablet - Android - Other (Specify in description)
1.1.0.0
Retrieved
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-20759.
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