The latest version of Chrome 86 is no longer causing issues with Cognos. IBM has issued a statement that the newest version of Chrome is compatible with Cognos.

Please advise any Chrome users experiencing issues running Cognos reports to update their Chrome browser to the latest version by going to "Menu --> Help --> About Google Chrome"

Optionally, customers using Changepoint 2020 or Changepoint 2017 SP2  can upgrade to a newer version of Cognos (11.1.7 Fixpack 1), which also works fine with Chrome 86. See below for details:

19.00.132.000 Cognos Patch release notes

18.02.117.000 Cognos Patch release notes