Data Recovery of Film Footage
It's a nightmare and really stressful to the crew, especially the director, DOP and producer. If you have a good DIT on set they can normally recover footage without you ever knowing it was temporarily lost.
SanDisk extreme pro 2tb / 4tb have reported issues around the time of publishing this article.
Samsung T5 / T7's is reportedly a better option.
Some useful places to start if you want to try and recover data yourself for free.
Disk Drill seems to recover all the simple things like partitions. Mac/Windows free/Pro versions.
Ease US is also available Mac/Windows free/Pro versions.
Read all the instructions first before proceeding at your own risk.