[Known] Yellow bundles always drop same artifacts

With my casual play, so far, I've found about 10 or so yellow bundles and they always seem to drop most of the below same artifacts, never anything different:

Ancient Two handed Sword
Crossbow of Accuracy
Cutlass of Swashbuckler
Gauntlets of Lead
Halberd of Sun
Sword of Speed
Two Handed Mace of Unsummoning
Wand of Static Discharge
Wand of Undying Embers

Considering this list of artifacts: https://www.shroudoftheavatar.com/f...artifact-database-no-discussion-please.78112/ do the yellow bundles only configured to drop the artifacts I listed above (other than cabalist ones), and the rest are only meant as a rare drop from a boss monster, or the artifacts that I listed just have a very high base chance of dropping and x50 recent artifact drop increase makes them drop very often now? I've never seen any of the other artifacts, other than what I listed.

Is it possible maybe to add all the artifacts to the appropriate drop tables and decrease their drop rate to say half of what it is now? Or some artifacts are strictly meant to drop from the bosses? It's ok of they do, something to look forward to, I just wanted to know if something is bugged, since the above I listed drop very often. If they had a very high base chance to drop before the drop rate increase, it explains it. If not, then something may be is buggy? Thank you.

 

I've bugged it for review: # 58752. Thank you
@Andrew Silverston

 

This is by design. Bundles drop a subset of artifacts, not every artifact available.

 

Ok thanks. I thought bundles were the only delivery system of the artifacts, that's why I thought it may be bugged. Will look forward to the future then... when I can take on bosses.