If you try to change your nickname colour, your nickname can disappear. After it I have an empty nickname and I can't change it anymore.
Also that bug can be when you try to change name of the world or write on signs with colour.
It usually appear when I changed colour many times.
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If you did not already, please remember to perform a search before creating a ticket to see if your bug hasn't already been reported.
This issue was reported previously as MCPE-8750; comment your experience there!
Bug has been reported MANY times. Next time please research to see if the bug as already been reported.