Sorry, I know this is late in testing, but I recently discovered the following

My goal was to select a few lines of text.

So, I used the following for testing:

Text to use:

Hello world.

This is a test.

Notice, that there are a newline between the two sentences.

I hold dots 13 down and swiped left to bring the cursor to the start of the text buffer.

Then I changed the preview mode to line.

I hold down dots 2 and 3 to select text and swiped right:

Observed:

MBraille said: This is a test

Expected: MBraille said: Hello world.

I could confirm the selection by swiping up with two fingers while holding dots 23 down.

Now, I wanted to select the next line:

This is a test.

This was not possible.

Observed: When I swiped right while holding dots 23 down, MBraille repeated: This is a test. Not selected.

This might also be the case for paragraphs.