This has been identified as a difference in the Salesforce API and how fields are queried for both Salesforce Lightning and Salesforce Classic. In turn, this has impacted LCRM Lightning and LCRM Classic Gift Batch tools.
The LCRM engineering team is working with Salesforce on a solution, and we are also planning for a LCRM hotfix soon. More information will be provided as it becomes available.
In the interim, gifts can be entered successfully through LCRM Lightning Gift Batch Entry or through manual gift entry.