why vue3 warnHandler can not print the warn of hydration node mismatch of SSR ?

[renzhen-xiaohongshu]

I got a problem when I use SSR :

Then I try to use app.config.warnHandler to filter it, but I get:

Then I found it:

Can someone tell me is it the question of vue core? The code of warn in vue core is:

i cannot create a issue because it is so complex that I can not create an example online.

[renzhen-xiaohongshu]

I think in function warn, it should check the value before it use args.join(' ') to avoid some values could not be convert to string implicitly。