To recreate:
1 - Go to cataloging
2 - Select 'New from Z39/50'
3 - Search, find a record, import
4 - Save the record
5 - Error!

Checking the logs you should see a dump of the record in xml - Koha chokes trying to access it as a MARC::Record

In C4/Search.pm:
2492 If we are using elasticsearch, it'll already be a MARC::Record and this
2493 function needs a new name.
2494 
2495 =cut
2496 
2497 sub new_record_from_zebra {
2498 
2499     my $server   = shift;
2500     my $raw_data = shift;
2501     # Set the default indexing modes
2502     my $search_engine = C4::Context->preference("SearchEngine");
2503     if ($search_engine eq 'Elasticsearch') {
2504         return $raw_data;
2505     }

However, that doesn't seem to be the case, we are still getting marc XML, adding "&& 0" to the if and nullifying that section (or removing it) seems to solve the issue