Edit: Now irrelevant since the question was updated.
Hello @Vaclav_Bocan , this seems similar to How can I change the spacing between lines of a math.equation in "block" mode? - #4 by SillyFreak
I would try something like
#show math.equation.where(block: true): set par(first-line-indent: 0pt)
Although from your example, it doesn’t matter as the block equations are centered by default.