this is the default behaviour. In my opinion this is done to get all routes again into the BGP table and apply the new route-targets in BGP.
I also would appreciate a warning message BEFORE this is done automatically, but it does not exist.
By the way, there is no impact on OSPF, EIGRP and so on between PE and CE. Only BGP is affected. In case of IGPs between PE and CE it therefore might happen, that new RTs are not applied immediately. You might need to manually trigger this (clear commands).
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