Actually, it is not possible to put special characters on sign and command block. Impossible to put : é, è, à, @, &, # ... We also can not write the special character for color ! This bug need a quickly fix.
When we try to put special characters on a command block, all the commands disappear, it's really handicapping especially for long commands.
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Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-62559.
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Gonna be fixed ?