It looks like qmlplugindump may be the culprit:

qmlplugindump Ubuntu.Components 1.3

is enough to reproduce the warnings with an installed UITK.

** Summary changed:

- was created without a valid QML Engine
+ qmlplugindump spams at build time: was created without a valid QML Engine

** Changed in: ubuntu-ui-toolkit (Ubuntu)
       Status: New => Confirmed

** Changed in: ubuntu-ui-toolkit (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1551665

Title:
  qmlplugindump spams at build time: was created without a valid QML
  Engine

Status in ubuntu-ui-toolkit package in Ubuntu:
  Confirmed

Bug description:
  Recently building UITK produces zillions of warnings:

  Found a dependency on Ubuntu.Components.Themes with two major versions:0.1 
and 1.3 which is unsupported, discarding smaller version
  Found a dependency on Ubuntu.Components.Themes.Ambiance with two major 
versions:0.1 and 1.3 which is unsupported, discarding smaller version
  The item UCHeader was created without a valid QML Engine. Styling will not be 
possible.
  The item UCBottomEdgeHint was created without a valid QML Engine. Styling 
will not be possible.
  The item UCBottomEdge was created without a valid QML Engine. Styling will 
not be possible.
  The item UCMainViewBase was created without a valid QML Engine. Styling will 
not be possible.
  <Unknown File>: QML ListItemLayout: Invalid attached property!
  <Unknown File>: QML ListItemLayout: Invalid attached property!
  The item UCLabel was created without a valid QML Engine. Styling will not be 
possible.
  The item UCLabel was created without a valid QML Engine. Styling will not be 
possible.
  The item UCLabel was created without a valid QML Engine. Styling will not be 
possible.
  The item UCAppHeaderBase was created without a valid QML Engine. Styling will 
not be possible.
  The item UCAppHeaderBase was created without a valid QML Engine. Styling will 
not be possible.
  The item UCActionItem was created without a valid QML Engine. Styling will 
not be possible.
  The item UCActionItem was created without a valid QML Engine. Styling will 
not be possible.
  The item UCStyledItemBase was created without a valid QML Engine. Styling 
will not be possible.
  The item UCStyledItemBase was created without a valid QML Engine. Styling 
will not be possible.
  The item UCStyledItemBase was created without a valid QML Engine. Styling 
will not be possible.
  The item UCStyledItemBase was created without a valid QML Engine. Styling 
will not be possible.
  The item UCStyledItemBase was created without a valid QML Engine. Styling 
will not be possible.
  The item UCAbstractButton was created without a valid QML Engine. Styling 
will not be possible.
  The item UCPageTreeNode was created without a valid QML Engine. Styling will 
not be possible.
  The item UCListItem was created without a valid QML Engine. Styling will not 
be possible.
  The item UCListItem was created without a valid QML Engine. Styling will not 
be possible.
  The item UCPageWrapper was created without a valid QML Engine. Styling will 
not be possible.
  The item UCPageWrapper was created without a valid QML Engine. Styling will 
not be possible.

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