Data Import / Mapping: Using Custom ID for both Tax Lot and Property doesn't establish the proper paired relationship

[RDmitchell]

Instance: staging
SHA: b264666

I can't figure out if I am doing something wrong or if the program isn't behaving properly.

Here is a doc with detailed info
https://docs.google.com/document/d/1u9IC6S9kVTZ3uveKyWS2SkswY4NAQ_pNC0opTiFvb5Y/edit?usp=sharing

Here is the folder for this issue with the sample data file
https://drive.google.com/drive/folders/19fqqif0VT1wC5p7SIxKXuI8QvJfj3OvE?usp=drive_link

@kflemin -- not sure what priority this has, since probably most people don't map using the Custom ID fields, but wanted to record it.