Having these same problems
Collections and onStart not behaving well and failing with error Invalid Mashup Expression
The expected behaviour still works fine in "Edit" mode. Still just "Play" mode it is not working.
Im still having same issues
everthing runs fine in edit mode but in production errors with collections on one app and on another without collections dropdowns not showing data.
both on version 3.18043.22
The requested operation is invalid. Server Response: Invalid Mashup Expression using supplied values. inner exception: The column 'collection' of the table wasn't found.
@Jswanson, @AhsenB, regarding the issue with Collections not behaviing well when used in the OnStart property, can one of you provide a session ID of the issue reproducing with the 'Navigate()' rule added at the end of the OnStart rule? You can find the session ID by clicking on the gear icon in the top right corner of WebPlayer or in the Menu -> "Session details" section of the iOS or Android players.
Now on play
Session ID: 7f3bb173-bc49-432b-a820-9f726e57b983
just Published and showing version 3.18043.22 on the version history
Still having collections breaking on start
I am still having collection issues but my PowerApps ID will not update to the latest version. I re-published this morning with no joy.
Still stuck on:
Session ID: 6c05adad-6df0-4c6a-8045-98c1adcfe981
Fill out a quick form to claim your user group badge now!
Find out where you can attend!
Features releasing from October 2019 through March 2020
The largest Power BI, Power Platform, and Data conference in New Zealand