The CR requirements for INF1, INF2 and INF3 were not changed in the patch.
They remain as…
- INF1 CR - Open World (30120), Dungeons (31220), Raid Bosses (31620, 33120, 34520, 35920, 37320).
- INF2 CR - Open World (33320), Dungeons (33520), Raid Bosses (34520, 35720, 36920, 38120, 39320).
- INF3 CR - Open World (39320), Dungeons (39520), Raid Bosses (39720, 40120, 40520, 40920, 41320).
The only new CR requirements are for INF4 and above.
- INF4 CR - Open World (41165), Dungeons (42065), Raid Bosses (42065, 42965, 43865, 44765, 45665), Gauntlet (45665).
At your CR, playing in INF2, your CR is fine for open-world, dungeons and the first two / three raid bosses.
Where are you seeing the warning about mobs being too dangerous?
When you have the warning, and click on the triangle, it should show why it thinks you’re too low for the difficulty you’re at. Can you post a screenshot?