I feel bad for having to ask about this, but how can I mine strategic resources? I have a colonized planet where there is Hyperium and I also have that tech, Galactic Stock Exchange (or whatever its English name is). And my ppl do farm Titanium, but no Hyperium.

Also, does mining Luxury resources work the same? What exactly triggers how I get resources?

There's currently a bug with mining on planets with multiple resources, I believe it is fixed in beta-branch.

Thank you. I couldn't find anything about this on the patch notes of 1.0.4 and since there seem to be other game breaking bugs I've been hesitating to subscribe to it. Should I just wait?

It was in the patch note of 1.0.3

If you just want that stick to 1.0.3 but 1.0.4 fix a few other bug

Can you tell me where to find the 1.0.3 patchnotes?

Here you go: https://www.games2gether.com/endless-space-2/forums/65-general/threads/25594-preview-branches-preview-1-03-and-fixamd-1-03?page=1