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That could truncate text in the middle of words. You might want to wrap it with another function to remove the last word from the result, truncated or not.
To trim excess words until it is below the character limit, you can do this:
{{ replace(substring(1.description; 0; 120); /\s.*?$/; emptystring) }}
See Telegram to mastodon text limit - #3 by samliew for more information.
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