I just set to the game.project:

fixed timestamp = 30
update frequency = 60
use fixed update = true

And now looks some Defold messages are lost and removing objects feature now works not every click. Sometimes it works every click, sometimes not.

Is it a correct behaviour?

Why do I need settings like this?
Only for consistency purpose. I wanna have physics update running 30 FPS on every device no matter it can render now on 30FPS or 60FPS, I just wanna slow down the physics updates. I think it's too overhead to run physics on 60FPS if device can render only 30FPS like iPhone does in HTML5 (low power mode). But if I use default physics settings then my physics running two times slower on iPhones in low power mode.