Canon’s own advisory states that version 1.1.2 fixes a condition where image recording to the memory card may not complete. The same fix is reported for the EOS R6 V.
This is an important distinction: it applies to those specific models, not every Canon R6. Check the model and firmware version before downloading anything. Canon says no update is needed if the camera already runs 1.1.2.
Because firmware changes can themselves be disruptive, follow the manufacturer’s instructions exactly and do not update a camera in the middle of a paid shoot.
What to do: If you own an affected R6-series body, verify its firmware and follow Canon’s official advisory before the next shoot.