I was going to open a new thread but it's enough to use yours.

Sneak attack is currently not working as of build v4.1.8.2651 (GOG).

Here are some screenshots:

Ranged:
[Linked Image]
[Linked Image]

Melee:
[Linked Image]
[Linked Image]

Checked on https://larian.com/support/baldur-s-gate-3?platform=1&query=sneak and found no report.Hopefully someone from Larian is reading these posts we are making.