When I set up the sign and enter the text, it appears temporarily, but after a while the text disappears.
The text is entered in Japanese.
It doesn't happen all the time, but it happens frequently.
I have logged in to the Realms world with multiple people, but it seems that there are problems with multiple devices such as Windows 10 and Switch, including players other than me.
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Thank you for your report!
We're tracking this issue in REALMS-9191, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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