Tests start failing when upgrading from 1.5.2 to 1.5.3

[Øyvind Smestad]

Describe the bug

For our code base a lot of tests start failing when upgrading from 1.5.2 to 1.5.3 or 1.6.0. It seems to relate to deep object comparison where we use Immutable.js. I'm guessing, but maybe related to this change: #5621?

Reproduction

https://stackblitz.com/edit/vitest-dev-vitest-qtcox7?file=test%2Fim.test.ts

System Info

Any? at least on Macs and Linux and Stackblitz :-)

Used Package Manager

yarn

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