Problem with Simple address on page with EPiServer.Marketing.Testing A/B test running

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Site is running 11.20.12 and where the problem is seen it uses Web Forms based templates.

Relevant packages:
EPiServer.Marketing.KPI 2.5.5
EPiServer.Marketing.Messaging 1.3.0
EPiServer.Marketing.Testing 2.6.10

A page has a Simple address set. It also has an A/B test running. It works fine for a while, can be days, but we've had instances where only B loads and A gives a 404 when trying to access the page by the Simple address.
With the issue active there seem to be no problem using the regular content URL.

Have tried SQL Profiler in this instance on our test environment with very little activity and don't see anything related to the Simple address or the page suggesting the error might be related to cached data.

We have not been able to log anything relevant but will try this when we see the error active in the test environment again.

Is anything known about issues with EPiServer.Marketing.Testing page version A/B test on a page when requested using the Simple address?

#293211
Edited, Dec 15, 2022 21:25
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