Within the email builder, when adding a custom personalization token (let's use First Name in this example), the word "First Name is in dark orange, but the "padding" around the word (where the spaces register between words), is way to light. My team has made this error multiple times by total accident. If we could personalize the colors of the tokens appearance in the builder, or remove the "background" color of the token name, that would dramatically help ID any missing or extra spaces. Image one has a space, while image two does not. If you aren't really paying attention, like really looking out for that specific thing, you'll miss it.
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