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Document mode IE10 on classic pages is giving problems with loading modules #1617
Expected or Desired Behavior
When running an SPFx web part on a classic page, it should not behave differently as in running it on the modern pages.
We noticed that on some tenants, the document mode of the classic pages is still on IE10. When this is the case, the web part returns the following error when loading it in IE11:
I have tested the web part on a couple of tenant, most of them are running in
Loading the web part on a modern page works fine in IE11.
This seems to be related to the MC127395 where we informed that we are moving away from the IE10 mode. That admin message also contained instructions to handle ghosted master pages, which seems to be the case in the tenants where you can see the issue - as the rollout has been already completed.
Key information about the guidance is available from the following article, as we apparently are not exposing these messages outside of tenant admin message center - https://www.linkedin.com/pulse/microsoft-making-some-changes-sharepoint-online-pages-yvonne-wright-1/.
Closing as there's really nothing else we can do here. If you, however, see the issue still after re-ghosting the master pages, please let us know.