`osx_image` is not inherited into explicitly included jobs

Early Releases Build Config Validation
1

Reported at Getting `xcrun: error: unable to find utility "altool", not a developer tool or in PATH`, how can I make `altool` available?.

A minimal reproducing example:

dist: bionic
osx_image: xcode11.3
jobs:
  include:
  - os: linux
  - os: osx

Presumably, during matrix expansion, os defaults to linux, causing osx_image to be ignored.
This ignorance should happen later, after initial configurations for all jobs have been formed.

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Getting `xcrun: error: unable to find utility "altool", not a developer tool or in PATH`, how can I make `altool` available?
After migrating to travis-ci.com (from org), I get "An error occurred while generating the build script." on MacOS