I'm not quite sure if this is me misunderstanding the rules or if it's a bug on D&D Beyond, but I created a Wizard with a dip into Artificer and grabbed an Arcane Grimoire, +1. The item is supposed to only increase the Save DC and Attack Rolls for Wizard spells, but it seems to be affecting the Artificer spells too. Here's a link to the character sheet. Currently the only Artificer spell on my character sheet that has a Save DC or Attack Roll is Sanctuary, but I've tested it with other spells for the same results.
I'm not quite sure if this is me misunderstanding the rules or if it's a bug on D&D Beyond, but I created a Wizard with a dip into Artificer and grabbed an Arcane Grimoire, +1. The item is supposed to only increase the Save DC and Attack Rolls for Wizard spells, but it seems to be affecting the Artificer spells too. Here's a link to the character sheet. Currently the only Artificer spell on my character sheet that has a Save DC or Attack Roll is Sanctuary, but I've tested it with other spells for the same results.
It's a known issue with the Tasha's-added spellcasting focuses.
Helpful rewriter of Japanese->English translation and delver into software codebases (she/e/they)
Thabks. I wasn't sure and I couldn't find any similar threads. Guess I just didn't dig deep enough.