Suppressed transactions printing on 1099 NEC

What do you mean when you write that you have "suppressed" a transaction?  I've never heard of that before.

Generally expense reimbursements won't use 1099 mapped accounts, because they use the accounts the expenses are for (like office expense or something.)  That should exclude them automatically.

I have a few contractors with whom I reimburse travel expenses.  I can suppresses those items from printing on their 1099's.  For example I pay them 150K in consulting and 3K in travel.  I have always been able to exclude the 3K from their 1099.  Upgraded to QB2019 last year and now with no other changes, the 3K is getting included in the 1099.

 I would agree with you.  As with other years, during the printing wizard of 1099, I make sure the account numbers for all of my 'reimbursement' items say not to print on 1099.  This year they are printing, below is an example.  I know it has to be either a programming error, or I am working too many hours.  

Account numbers do not actually "say" anything about whether or not an account is included on a 1099. 

1099 mapping of accounts to 1099 boxes does that.  This is done in the 1099 wizard.

If you step through the wizard and check the accounts that are mapped to the boxes you're seeing an issue with, unwanted accounts are probably mapped.  If so, un-map them and then you'll get the expected results.