Oresight potions don't show the ore, I even tried /setblock to set the block under me to that ore and it still didn't work.
Except sometimes it does. I think it is related to standing on the surface.

On version 0.4.22 still happens.

Yes, I can confirm 0.4.20 is not showing ores with any potion or charm either. :(

Edit: I'm not using shaders nor optifine, just plain atm7 0.4.20

This appears to be caused by moving dimensions with the buff active. Returning to the dimension it last worked in, disabling the charm or waiting out the buff, then returning to the overworld, causes the buff to start working again.

(I am running 0.4.21)

Have the same problem

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

This is definitely still an issue.

Yep, same for me. I'm playing on Mac but I don't think that is the issue here. I've taken ore back to the void dimension with silk touch and it still doesn't work. Neither ore sight potion or charm works as intended.

Confirming I have also run into this issue.

There seem to be multiple situations that can cause drawing the outlines to fail.
Mining Gadgets lights: #1383, #1268
Crossing Dimensions: #1236, #1149
Unspecified: #1575, #1016

In my case, it is the Feral Flare Lantern. Placing the lantern down doesn't immediately cause the outlines to disappear, it only occurs once the first invisible light is generated. At that moment the outlines disappear.
However if I then break the lantern, which removes the invisible light, the outlines comes right back.

There is an open issue with PotionsMaster thevortex/PotionsMaster#3 , however the root cause of the issue has not yet been tracked down.

Whoa. Nividica, I have been using feral flare lanterns too. If this solves my issue then you are my hero forever.

Well, for today at least. :)

It seems to have solved it. But it still seems to be a bit iffy in the TF. On the hill where I had used feral flare lanterns, after removing them and deleting the hidden light sources some outlines did show up. But turned my back and they disappeared again. I went to a new unvisited hill and there I had outlines immediately, but again sometimes you turn around and they've disappeared. Anyway partly solved, thanks a bunch Nividica !

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.