I appreciate the steps you had provided, and I had forwarded it earlier this week. Sorry I did not mention this earlier.
We have been able to reproduce this issue and have a fix on its way. I'll communicate again when it begins to roll out.
You may consider @skylitedave's work arounds in the near term. I apologize that this issue is inconveniencing you.
For future reference, please view and bookmark the PowerApps Support page for the health status:
A fix for the ETAG Mismatch issue is included in version 3.18073 which will be rolling out next week. I'll ping again at that time to confirm you've received the update.
I have the version "PowerApps 3.18073.24" and I'm getting this error.
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