I'm seeing some issues with contact importing, and I wondered if anyone else is? Civi 5.58.0 on Wordpress with PHP 7.4
We have a process where we fairly regularly reimport existing contacts back into the system, using the contact update option to update the contents of custom fields, with data from a CSV file.
Attempting any import of individuals using First Name & Email supervised dedupe, even if only first name, last name and email is contained in the data results in all contacts failing with error "Mismatched contact type." I was initially seeing this bug: https://lab.civicrm.org/dev/core/-/issues/3927 but it is happening even when the update to a related contact is removed.
Attempting to import a list of individuals using first name & email unsupervised dedupe, and also trying to update a single custom field results in all imports failing with error "'1' is not a valid option for field custom_12" even though "1" is not a value contained anywhere in the CSV
So far as I can see, randomly one attempted import did "work", but the process erased the contents of some custom fields in Civi despite there being valid data in the CSV.
All was working fine before the recent security update - though the third item, where the import appeared to work, does obviously make me wonder if something is up with the server.