Why are emoji not showing up?

Question

JavaScript

Hello. There is a node.js script that sends messages to the messenger. The problem is that some of the emoji (in particular, etc.) are sent to the chat as a question mark. If you copy any of these emoji and send it manually, then everything is sent perfectly. At the same time, other emoji (♻️ ⏰, etc.) are sent correctly by the same script. In the database, all emoji are recorded correctly.
What could be the problem?