Malaysia 2004-2005 Endangered Species Series, wrong dates? [solved]

Hello, I would like the second series of Malaysian Endangered Species coins (2004-2005) to be reviewed, as I believe there weren't actually two separate issues. 

https://en.numista.com/catalogue/index.php?e=malaisie&r=&st=147&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&cu=&a=&dg=2004&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&se=3229&c=&wi=&sw=

I think it's a single issue with the year 2004 on the coins and year 2005 of issue, according to the attached link and as written on the individual coin cards.

https://www.bnm.gov.my/-/coins-in-education-program-issuance-of-the-second-series-of-the-endangered-species-series

I haven't been able to find any coins dated 2005 (I think they're all 2004 dated), so perhaps these two year lines should be merged to show 2004 (2005), since 2004 is the date on the coin and 2005 is the actual issue date and the one shown on the coin cards (or maybe I miss something)

I look forward to your responses.

Colnect and Ucoin only list 2004 for these 12 bird coins. 

https://colnect.com/es/coins/list/country/130-Malasia/series/125701-2003%7E2005_-_Endangered_Species_Series_-_Commemorative

https://en.ucoin.net/catalog/?country=malaysia&period=153&type=2

Standard Catalog of World Coins lists only 2005 (the year of issue, but not the year on the coins). 

Only Numista, and I believe this is incorrect, lists two years (2004 and 2005). I still think it should list 2004 (2005).

Poke @Linketake42 @Jarcek 

Someone added years as they are on the items and someone added Krause years…

Many thanks Jarcek, maybe it could be ok the format 2004 (2005) as we know the coins were issued in 2005, don't you think?