While the Unicode characters are technically supported, the rendering engine is not consistently pulling the correct color emoji font or is failing to display specific symbols (like the Heavy Check Mark ✅) which appear as a square. This indicates a font fallback issue for many users, despite the feature being marked as 'implemented.' (https://feedback.onlyoffice.com/forums/966080-your-voice-matters/suggestions/50490639-it-would-be-great-to-be-able-to-insert-emojis-in-t)

Suggestion: Request a review of the font fallback logic to prioritize system color emoji fonts (e.g., Segoe UI Emoji) for all Unicode characters that have an emoji presentation style.