Version

3.2.26

Reproduction link

codesandbox.io

Steps to reproduce

Create transition-group with tag and class, on SSR it won't have any data attribute if needed or class provided

What is expected?

To have all attributes/classes provided by code

What is actually happening?

It doesn't have any attributes/classes provided by code

It's 3.2.31 and the bug still remaining! @LinusBorg