Error while using Word import - A page already exists with the title - whereas "rename" option has been chosen

Hello,

I am importing a Word file through the import word regular feature.
While doing so, I am selecting "rename title" in case of conflict with an already existing page(see screenshot).
However, I am getting an error: A page already exists....
(See error below + stack trace attached)

--> Why is the corresponding page not renamed, as per option choosen ?

To note (in case...):

• Trash bin of the space is empty
• Wiki service has been stopped & restarted No change.

I am intending to import some documents, as part of a knowledge DB, sharing the same structure, thus having frequently similar titles between tehm. How can this issue be fixed ?
Thanks.

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Cause

com.atlassian.confluence.pages.DuplicateDataRuntimeException: A page already exists with the title Transition phase in the space with key PRES
at com.atlassian.confluence.pages.DefaultPageManager.throwIfDuplicateAbstractPageTitle(DefaultPageManager.java:833)