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I had the same issue and fixed it by adding the following in the imports:
import 'tinymce/icons/default'
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TinyMCE 5 contains an icons
folder with two JavaScript files. It would appear that you have not included that content in what you deployed to production.
I don’t know how you package your application but you likely need to add something like this in the code that packages your application:
{
"glob": "**/*",
"input": "node_modules/tinymce/icons",
"output": "/tinymce/icons/"
},
Source:stackexchange.com