Data: Is Omitted is not working if the omitted fields have already been used in another import -- that Is Omitted data IS imported

[RDmitchell]

Instance: production
SHA: b264666
Org: LBNL 5333

It does appear that the "Is Omitted" functionality is NOT working if the fields that are omitted in one import have already been mapped from another import.

This doc has more details

[RDmitchell]

folder for this issue, with sample files used in these tests
https://drive.google.com/drive/folders/1_6Bu1-Jc3dTfBtY6t5M-DdaCVE_GvRq_?usp=drive_link