Steps to reproduce:

1. Set NVDA's output Braille table to use English (US) grade 2.
2. Ensure "Expand to computer Braille for the word at the cursor" is enabled.
3. Use a connected Braille display OR the Braille viewer from NVDA's tools menu.
4. Open Notepad.
5. Type text including a URL, eg:
   NV Access https://www.nvaccess.org/
6. Press control+right arrow twice to the URL.
7. Press LEFT ARROW to the end of the word then right arrow to the URL.

Actual behavior:

NVDA stops responding at step 7.

Expected behavior:

NVDA should read the URL and keep working normally.

System configuration

NVDA installed/portable/running from source:

NVDA version:

NVDA 2019.3.1
NVDA 2020.1 portable
NVDA 2020.2 portable
NVDA 2020.3rc1 installed
(I couldn't test any earlier as I don't have a Braille display handy and the Braille viewer was introduced in 2019.3).

Note that:
NVDA 2019.3 used LibLouis commit 58d67e63
NVDA 2020.1 used LibLouis 3.1.2
NVDA 2020.2 and newer use LibLouis 3.1.4

Windows version:

Windows 10 (64-bit) Version: 1903 Build 18362

Name and version of other software in use when reproducing the issue:

Notepad, but reporting user advised it happens in other programs as well.

Other information about your system:

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

As above

If addons are disabled, is your problem still occuring?

Yes

Did you try to run the COM registry fixing tool in NVDA menu / tools?