It seems that you've encountered missing wallpaper font color palettes after an update on your beloved Samsung Galaxy S21 FE device, and we apologize for the inconvenience it caused you.
If it happens on my device, I'll get frustrated too, expecting my device to perform better after an update, but as it turns out, it came up short. But don't worry, we are here to guide you, and offer solutions to restore your device to optimum performance.
To pinpoint the root cause of the issue, you may submit an error report through the Samsung Members app as follows:
Step 1. Long press Samsung Members icon on Apps screen and tap Error reports.
Step 2. Tap OK on agreement popup to send system log data.
Step 3. Select Symptom category "Settings/System".
Step 4. Describe the problem in details and SEND.
For more assistance and guidance, you may contact us via our online Samsung Customer Care support channels below.