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The issue you’re experiencing could be the result of the way that Google Analytics 4 (GA4) calculates Engagement rate and Bounce rate, which might not be aligned with your custom dimension settings. When you apply a custom dimension, GA4 might not find suitable data to calculate the Engagement rate and Bounce rate, which could explain while these numbers are falling to zero. Please ensure that the event data assigned to the custom dimension are suitable for these metrics. Remember, ‘Engagement rate’ is calculated as Engaged sessions divided by Total sessions. ‘Bounce rate’ in GA4 is calculated differently than in Universal Analytics, it’s now Engagement bounces divided by Total sessions. According to Google, an engagement bounce is when a user visits your site, and leaves within 10 seconds, or visits just one page on your site, or has less than 2 engagement events. Your custom dimension should reflect this new calculation. If it doesn’t, it could result in a 100% bounce rate or no data at all. If you are sure your dimension is correctly configured, you might need to get in touch with Google’s support to dig deeper into this issue.
