I have the same problem as Adding people from RootsMagic to Ancestry Tree via TreeShare
There was no solution and the new update didn’t help.
I reset my TreeShare-Connection several times.
It is not due to duplicated persons.
I have one new person at RM8, I add it to Ancestry via Treeshare. I will not appear on the list, but there is a new person on Ancestry, but just the name without more information (birth, death, etc.). The link to other persons are missing, too (no children/parents) and this new Ancestry-person is not linked to the RM8-person.
If I link them manually, it will stay for 1-3 sessions and then the link (RM8-Ancestry) disappears. Additionally, On the RM8-site, I have a double entry for this person during in the TreeShare, not on the RM8-person page. One entry of the person is not linked to ancestry, this other one is.