Flamingo 5.5 exposure inconsistency creates problems for Bongo

Scenario: animation for mechanical parts
If there is anything “shiny” in the frame, image gets quite dark.
Please check my test here

Same background. All the possible white.

test2. Nothing changed in any possible setting. Just added the part on the bottom

And here we get the problems with the Bongo animation. Frame 22 and frame 23.
Exposure should be fixed during all animation, to get an even and not flashing effect. I am a photographer with 45 years experience, if you need any help, please ask