Something could have gone wrong during your latest update, so I'd try to install a fresh copy of your iOS 13.4.1.
To perform that procedure, create a full backup of your iphone, then restore it to factory settings, and, in the end, set it up as new, using these instructions:--> Restore your iPhone, iPad, or iPod to factory settings – Apple Support
When done, test your iphone (for widgets) for a while, without restoring data form your backup.
If everything is okay, restore data form your previously made backup:--> Restore your iPhone, iPad, or iPod touch from a backup
Regards
Giulio