CommentStreams:B8678f4aed9a496efade592cb6f51bf3

I suppose it's because this table is community-populated and only very few people so far complained about the bug you mentioned. Also, for the bugs which are hard to reproduce documenting them here is very unlikely to bring developer attention. For these I would contact customer support as their investigation would probably require details about your account where the issue happened.

Personally, I suspect that what you are referencing as a bug is just the confusing behavior (same as for the cards) where the first artifact dup is not counted towards your total, so after getting 5 dups the UI will show 4/1 (4 dups available for upgrades, 1 is required for the next level).