Blank page is seen when user tries to click on header back from enter amount page after visiting the send amount page

[ValoraQA]

Frequency : 100%

Repro on build version: iOS Appstore V 1.38.2, Android Playstore build V 1.38.2 , iOS Test Flight Release Build V 1.39.0, Android Internal Release buld V 1.39.1, iOS Test Flight Release Build V 1.39.1
Repro on device : Google Pixel 2XL(11.0), iPhone 12(14.7.1), OnePlus 7T(11.0)

Pre-condition:
1] User must have downloaded Mainnet build (fresh install)
2] User must have restored account
3] User must be on homepage
4] User must be have some funds in the account
5] User must have provided access to contacts

Repro Steps :
1] Tap on send button from homepage
2] Select a contact / enter address / enter valid mobile number
3] On enter amount page , enter a valid amount
4] Click on next button , user will be redirected to send amount page
5] Tap on header back from send amount page, user will be redirected to previous page
6] Tap on header back and observe

Bug : Blank page is seen when user clicks on header back / device back from enter amount page

Expected Behavior : User should be redirected to contacts page after user clicks on header back / device back

Investigation:

• The bug is also faced when user is on send secure page
• This bug is also faced when user adds some funds , and tries to send funds to another user
• Also randomly the estimated fees does not load on send amount page

Attachment : blank.mp4
bug observed at 1.40 seconds