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It doesn't look like all of the issues with the earlier build 8 speed transmissions are behind us yet. This bulletin released in December 2020 advises of the possible need for further ECU replacements and software updates. Some may be related to prior servicing not done right, others may be new issues creeping up. And while searching, I found a cover leak advisory issued in 2019.

Flex Lock-up is the ability of these new autoboxes to invoke the torque converter locking clutch in several of the upper gears (5th thru 8th IIRC), and in progressive steps.
 

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