Unavailable Crafting Recipes

(Disclaimer: I don't know if this is a bug so if it is feel free to move it to the proper thread thank you.)

So after a bit of mapping today I decided that I wanted to check my crafting bench to see if I was missing any crafting recipes. I noticed that there are two recipes listed as "undiscovered" which should be located in the acts.

Namely "Vaal skill damage - level 1" and "Life and Mana regeneration - level 1". Both of these recipes are supposedly located in the acts so I wanted to go and grab them to complete my crafts.

Now here's the problem. Neither of those crafts seem achievable.
In the case of "Vaal skill damage": I have ran the entire zone map multiple times including setting new instances. The recipe is visible on the on-screen minimap and there is an orange icon showing a portal right next to it. However there is no path in the zone that leads to both the recipe and the portal. I've ran the entire zone 10+ times - setting a new instance every time - and this is always the same.

In the case of "Life and Mana regen": This recipe doesn't even show up on the minimap. Again - I've ran the zone 10+ times with new separate instances for each. There's not even an icon on the minimap for this one.

Now my thought is that this could be an oversight (removed recipes) but in that case... why would they still show on the bench as undiscovered? Other recipes were completely removed too.
Can anyone share insight on this? I want to understand what happened with those two.

Not that the recipes matter that much to me but my inner completionist really would like to see the bench completely available.
Thank you.

Both of those recipes are now "hidden" and you have to find them.

Same goes for the recipe that is located in The Refinery. The wiki for these recipes mentions the hidden mechanic. In these cases, there will not be an icon on the mini-map for the recipe until you find the "hidden" mechanisms that unlock the rooms where the recipes are located.

Yeah I think there was an update to these fairly recently. I went looking for the refinery one and its in an underground room where you would not typically go unless looking for the recipe specifically. If you can see the room on the mini map you probably just need to find the entrance. In some cases these entrances are hidden, like above comments are saying, wont light up on the map. Which seems to be a newish mechanic they have introduced in recent leagues. Like the hidden levers in lab, or candlestick in act 3, but it is more prevalent now throughout campaign environments.