Command Block closes when editing a long command

When I edit a command inside a Command Block on Minecraft Bedrock Edition, I can make the command field larger to see and write more text.

However, when the command is long and I tap/click in the middle of the command to move the cursor and edit part of it, the Command Block interface suddenly closes and I leave the Command Block.

Steps to reproduce:

1. Open a world in Minecraft Bedrock Edition.

2. Place a Command Block.

3. Open the Command Block.

4. Enter a long command so the command field becomes larger.

5. Tap/click in the middle of the command to move the cursor.

6. The Command Block interface closes unexpectedly.

Expected behavior:

The cursor should move to the selected position and allow me to continue editing the command.

Actual behavior:

The Command Block interface closes when I tap/click in the middle of the command.

Additional information:

I recorded a video showing the problem. The video has no narration, but it clearly demonstrates the issue.