Groupon app for iOS: Share Sheet options not visible with device set to light mode

iOS 13.4.1
Groupon app for iOS (version 20.6)
Date: 04/28/20
iOS device set to: Light Mode
Description:

There are problems with the current (version 20.6) version of the iOS app when the iOS device is set to the light mode.

A large number of menu options in the share sheet are not visible.

Here's an example of the auto-generated email:

With the device set to light mode, the "Cancel" option is invisible...

Here's the auto-generated text message:

The "Cancel" option is not visible.

Here's the Facebook Messenger UI:

The "Done" option isn't visible in light mode.

Here's the More Apps area of the share sheet:

Can't see either of the two options at the top.

Steps to Reproduce:

1. Set the iOS device (13.4.1) to light mode
2. Launch the Groupon app
3. Select any deal
4. Share it/activate the share sheet
5. Choose either the text message, email, FB messenger or more apps options

Result: With the iOS device set to the light mode, the Groupon iOS app incorrectly displays the share sheet for the text message, email, FB Messenger and More apps options - menu options are white-on-white

Expected: This shouldn't be happening with the Groupon app when the iOS device is set to the light mode