Lost Girls OVA - Watch After Season 2? Season 3? (Patreon)

Hey all! Quick Attack on Titan question!

I originally planned to watch Parts 1 and 2 of the Lost Girl OVA's after Season 2 was over, then watch Part 3 after Season 3, Episode 12.

A YouTube Commenter seems adamant I need to wait until Season 3 Episode 12 to watch ANY of them...are there spoilers in those OVA's for Season 3 with Parts 1 and 2? I want to make sure it's safe to see them. ^^

Any comment/advice is appreciated!