Available balance disappears when entering a TEX address in the Send screen

[MarioAndrade82]

When attempting to send ZEC to a Zcash Z-address, the available wallet balance disappears after entering the recipient address.
Before entering the recipient address, the Send screen correctly displays my available ZEC balance.
As soon as I enter a valid Z-address, the available balance changes and is displayed as zero/empty (ZEC -,----).
If I remove the recipient address, the available balance appears correctly again.
Steps to reproduce
Open Zingo Mobile.
Go to the Send screen.
Check the available ZEC balance. At this point, the balance is displayed correctly.
Enter a valid Zcash Z-address in the recipient address field.
Check the Available balance below the amount field.
Actual behavior
After entering the Z-address, the available ZEC balance disappears or is displayed as zero/empty.
Expected behavior
Entering a valid recipient Z-address should not cause the available wallet balance to disappear. The amount of ZEC available for sending should continue to be displayed correctly.
Additional information
Removing the recipient address immediately causes the available balance to appear again.
The issue is reproducible consistently.
Platform
OS: Android
App: Zingo Mobile
Screenshots
Screenshot 1: Available balance displayed normally before entering the recipient address.
Screenshot 2: Available balance disappears after entering a valid Zec-address.

[juanky201271]

The address is TEX (tex1…), not Z, and privacy mode is on, so the amount was already hidden before. The real problem: max sendable is 0 for TEX addresses, which blocks sending. Root cause is in zingolib: zingolabs/zingolib#2767

Thanks for reporting @MarioAndrade82