sfdx - second generation packages - push custom fields fails silently

This is an unlisted known issue with sfdx. I created a git repository to reproduce the issue and reported it to SFDC in a case; https://github.com/JonnyPower/sfdx-push-bug-20190124

I received the following response on my case:

Our engineers are aware of this and are working to find a solution to fix it.

However we do not have an ETA on the fix yet. Currently the only workaround is what you have already mentioned; performing separate push for the different packages.

I asked for this to be reported as a known issue under Salesforce DX and am awaiting a further response.