1859 Boston births incorrectly indexed as 1850

I reported this through the "Feedback" button within the record but am wondering how else to report it.
In Film Number/Group Number 004212536, Images 116 through 250 contain births in Boston, Massachusetts in 1859 (see Images 114 and 115). At the top of each page appears: "BIRTHS REGISTERED IN THE CITY OF BOSTON, for the year eight hundred and fifty-". Clearly, the original recorder was supposed to write the word "nine" after the hyphen but failed to do so. Thus, all of the records are improperly indexed with the birth year 1850 rather than 1859. Also, FamilySearch appears to have created mini (three-member) family trees for many of the entries (dated 2012) that include the parents and the children with the incorrect 1850 birth year. In some cases, other users have attached the source to an ID that has the correct 1859 birth year, and, in some cases, the IDs in the mini-trees may have been properly merged—but not typically. Here is a link to Image 115 at the beginning of the pages, which shows the following pages are supposed to be 1859 births: https://www.familysearch.org/ark:/61903/3:1:S3HT-6QC3-6DJ?i=114
Answers
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The 2012 tryptichs are user submissions to one of FS's prior systems. The exact details of how and why elude my non-Mormon understanding, but many of the old indexes have such legacy profiles derived verbatim from their entries. Those prior systems had no means of combining profiles, so unless someone has cleaned up a family in the past dozen years, there are often many duplicates of parents who had more than one child.
Poking around in the Massachusetts birth record index, I'm surprised that it's apparently current. I was more than half-expecting it to be marked as a legacy collection, given that parts of it at least already existed before 2012. It has certainly had long enough to attract its fair share of errors in the metadata, such as getting labeled as deaths rather than births in the black banner across the index detail page (such as https://www.familysearch.org/ark:/61903/1:1:FX4F-S92).
While "wrong end of the decade" is certainly a problem and it would be nice if FS could fix all of the entries on all of the affected pages, I don't know if they can. If the error affects profiles in your family, you can edit the index and fix it for their entries, and if you have the time and energy, you can edit other entries, and/or find and fix the derived Tree profiles. If you can't spare that many spoons, you can console yourself that at least these entries have the parents indexed as the parents. I've encountered swaths of baptisms where the godparents were indexed instead.
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@SteveLinke This is clearly a serious indexing error as the names would not be retrieved in a filtered search using the correct year of 1850. I am compiling a list of collections with massive date errors for the use of engineering teams. I am only reporting errors of the primary event date or errors that would obscure people in an exact search, such as birth years on a census. I appreciate Community help, such as yours in this effort.
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