[SalesForce] Salesforce DX referring to Global picklist “CustomField not found.”

[ UPDATE! ] They have supposedly enabled this with a org definition file feature: https://releasenotes.docs.salesforce.com/en-us/summer18/release-notes/rn_sfdx_scratch_orgs.htm

Disclaimer: I have not been able to use this feature when I try to turn this on I get the error: ERROR: StateAndCountryPicklist is not a valid Features value.

[ Original Post ] I've ran into this issue as well.

I was able to configure which Countries and State to show under Step 1: Configure state and country/territory picklists.

Converted and Enabled the picklist and then... When I did a sfdx force:source:pull it pulled the configured Active/Visible country options under Address.settings-meta.xml

I tried spinning up a new scratchOrg and it pushed those configuration but I still have to manually re-convert and enable picklists again.

I know it's not the answer you're looking for but just wanted to share my progress.

I'll answer as I did find some kind of workaround

Those steps allow me to work DX-style with Managed Package, Namespace and Person Account

1 Create scratch org WITHOUT Namespace, using flag -n, --nonamespace

sfdx force:org:create -f config/project-scratch-def.json -a ScratchNONameSpace -s -n

2 First thing is to pull Account.Business_Account, which works as expected

$ sfdx force:source:status -r

=== Source Status
STATE       FULL NAME                 TYPE        PROJECT PATH
Remote Add  Account.Business_Account  RecordType

$ sfdx force:source:pull

=== Pulled SourceSTATE  FULL NAME                 TYPE        PROJECT PATH
Add    Account.Business_Account  RecordType  force-app/main/default/objects/Account/recordTypes/Business_Account.recordType-meta.xml

3 Create scratch org WITH Namespace

sfdx force:org:create -f config/project-scratch-def.json -a ScratchWithNameSpace -s

4 Check status, you'll see conflicts

$ sfdx force:source:status
=== Source Status
STATE                      FULL NAME                 TYPE        PROJECT PATH

Local Add (Conflict)       Account.Business_Account  RecordType  force-app/main/default/objects/Account/recordTypes/Business_Account.recordType-meta.xml
Remote Changed (Conflict)  Account.Business_Account  RecordType  force-app/main/default/objects/Account/recordTypes/Business_Account.recordType-meta.xml

5 Push your code using flag -f, --forceoverwrite

$ sfdx force:source:push -f
=== Pushed Source
STATE  FULL NAME                 TYPE        PROJECT PATH

Add    Account.Business_Account  RecordType  force-app/main/default/objects/Account/recordTypes/Business_Account.recordType-meta.xml

$ sfdx force:source:status
=== Source Status
No results found

After that you would be able to push/pull without issues.