There is an open and unresolved bug related to missing bark mounds in Odyssey in the issue tracker here:
https://issues.frontierstore.net/issue-detail/40108
The ticket is over 18 Months old, has been voted on many times and has (unsurprisingly) been completely ignored in terms of a fix.
I came across the ticket after spending many hours on different planets looking for Bark Mounds when they would pop-up as a bio signature and not find any so I done some digging around to see why I couldn't find them only to find its a known issue with Odyssey....
If they are not going to fix a bug or if its not going to be fixed soon (for whatever technical or resources related reason) they should at the very least remove the said item/mission etc. from spawning and remove it from the Codex if listed to stop wasting peoples time trying to find something that doesn't exist or doesn't work anymore.
Just leaving issues like this shows a complete lack of respect for the player community since without either fixing bugs promptly or taking actions to stop broken game features spawning then we are left to waste time and effort attempting to find something or do something that clearly will result in failure and then even more time trying to find out why.....