According to a report by the National Intelligence Council, submitted to President Macron, on the French ISIS fighters exfiltered from Syria, some 40 of them have joined jihadist groups in Libya. As a result of this geographical rapprochement, they are a major source of concern, as they could fuel plans for illegal returns to France.
On the other hand, several dozen other French jihadists have chosen to join ISIS-related organizations in Asia. This suggests that, for them, the priority, after their exfiltration from Syria, was to escape the hunt of the anti-terrorist services, by taking refuge in areas far removed from their country of origin.