Moving from 9.1.2 to 10: events are no more grouped by message like before

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Hi,
in my previous Sentry install 9.1.2 i had 2 projects that were used to logged user action.
Each event message was like this: ‘username:appName’
When we had to do support for a user, we were able to look at what he did when he had a problem.

Now with Sentry 10, it doesn’t work anymore. Why ? because it groups events into issue with a new logic, so under the same issue ‘user1:app2’ i can have log about user1, but also for user2, 3, 4…

How could i restore the previous grouping system for those 2 projects ?

I use Sentry Sentry 10.1.0.dev0 (12f448985f880d144620ce8eb92b710982edacfc)
and SDK PHP 1.10.0 (we will move onto 2.x this year)

Here is a sample of grouping for issue ‘user1:app1-mobile’ :

EVENT GROUPING INFORMATION
BY MESSAGE
Grouping Config	
newstyle:2019-10-29
Hash	
8cc5b36f81000fc7b7e2e2f24e9ad117
Type	
component
default
message (stripped common values)
"<email>:app1-mobile"

Thanks for help