Apple has released iOS 13.6.1 and iPadOS 13.6.1 which brings various fixes including one for an issue that could cause your screen to display a green tint.
iOS 13.6.1 includes bug fixes for your iPhone:
● Addresses an issue where unneeded system data files might not be automatically deleted when available storage is low
● Fixes a thermal management issue that caused some displays to exhibit a green tint
● Fixes an issue where Exposure Notifications could be disabled for some users
Some features may not be available for all regions or on all Apple devices. 
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