NRF52840 UART Problem

**Describe the bug:**
I cannot send data from the device to my mobile using UART.

**Set up**
- nRF52840 Sense
- Windows 11 / Arduino 2.00 RC6
- Bootloader

**To Reproduce**
- Upload bleuart example
- Open Serial
- Start Uart in Bluefruit App
- Reset Controller
- Go to Uart in App again
- Try to send something from the device (e.g. via Serial) to the App
- nothing will be send

**Expected behavior**
- Text is shown in App

Sometimes it already doesnt work without the reset. Sending from the App to Controller always works.
Strange is that when I comment out the blebas lines it works as exprected
When you leave Uart mode in the App and go back to Uart it also works even with blebas. But the red LED is blinking twice.
It seem that there is an interference with blebas.

Start with the bleuart example and reproduce the reset and Bluefruit App sequence on the listed nRF52840 Sense setup. Compare behavior with and without the reported blebas lines, including the red LED indication. Done means device-to-app UART text works after reset without requiring an app-mode switch.

Written by the indexing model from the issue text.