EXCLUSIVE: Earlier this week it was reported that Ballerina, the first of several planned John Wick spinoffs, had undergone substantial reshoots and that original Wick director Chad Stahelski had fully taken over for Len Wiseman for this process. From what we've learned, that's not the whole story nor entirely accurate.
The Wrap's insiders initially claimed that reshoots overseas in Prague took 2–3 months to complete and that the Ballerina director wasn't on set for the process. We're able to confirm with our sources that Wiseman did lead the additional photography on set in Budapest with producer Chad Stahelski helping with the action design on new scenes to bolster the film's action sequences.

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The David Castañeda (The Umbrella Academy) and Sharon Duncan-Brewster (Dune) were reportedly added to the cast for the additional scenes.
During the additional shooting phase, however, Wiseman suffered a serious health issue and was briefly hospitalized. This is when Stahelski had to step in to cover scenes until Wiseman returned. The Wrap has since updated their initial report.
Wiseman fully recovered, we learned, and returned to finish the film with the whole team, Stahelski included, alongside Thunder Road Films. Insiders tell us that Stahelski and Wiseman are champions of each other and Len is working on his cut of From the World of John Wick: Ballerina in post-production with Stahelski helping in a producer capacity.