This isn't a new bug and not really a bug.
When linking a record, the system might not recognize all the individuals in a household, it all depends on the indexing of the name and the relationship, but that's hit or miss. There are several ways you can check for existing family members on the review form and match them to the record you wish to link.
If you're using the beta review form, there can be additional issues.
The best you can do is work with a number of tabs open, and check existing data before you link more.