I think if you roll 1, it stays as 1. No add-up from guidance and proficiencies gets visualized.
Hm. I mean, that would make the most sense given Larian's version of nat 1's being auto fails... Wacky then.
@OP you should probably submit a bug report here:
https://larian.com/support/baldur-s-gate-3#modalIt sends your report directly to Larian.