The beta seems to work for me. Downloaded v6.3.2 (599) it prompted me to update to v6.3.2(601). After update to v6.3.2(601) I selected TouchId in prefs and it seems to be working. TouchId setting is still persisted after an app restart. So far so good.
Same behavior here. I am also an Enpass Pro member and I am currently using Enpass version 6.3.2 (582) on my Macbook Pro with macOS Catalina version 10.15.2