Engine Bay Rattle - Acceleration

2022 Prius Prime engine rattles (HV mode) under acceleration (75% throttle, under load usually going up hill at lower speed, moderate RPM)

Video here - checkout the 10 second mark:

Looks like another user here has the same issue: 2017 Prius Prime Hood Rattle | PriusChat

Shared with dealer, they acknowledge but cannot find the cause.

 

Another video of the vibration


Short 6 second clip of the vibration:

Full vid, with normal acceleration sounds at the first few seconds, then rattle starting at the 9 sec mark.

 

Usually happens uphill - lower speed <35 mph