On some devices (FR235 and FR735XT) including a non numeric character such as a '-' for padding or an '@' will make the font very small and unusable.
My paceband apps (https://apps.garmin.com/en-US/apps/a18bb975-f59c-43e0-9293-a0e69061a0d8, https://apps.garmin.com/en-US/apps/cf5d8304-f4c5-4bdc-83d8-135c26a9d728)
Tell you your split at an interval, so I use non numeric characters to seperate displaying the mile number from the time at the split
It seems to happen on real devices only
Steps to reproduce
1. create simpledatafield
2. return "@" from compute
3. run on real device
expected result : normal size text to match other fields
actual result: very small text that can't be seen while running