SSR - classes are not re-applied on hydration without a ref

[KaelWD]

Version

2.5.14

Reproduction link

No ref: https://codepen.io/anon/pen/yKyBYZ
With ref: https://codepen.io/anon/pen/PRwYPO

Steps to reproduce

Open the codepen

What is expected?

.has-padding should be applied after 2sec

What is actually happening?

Nothing changes on hydration unless the element has a ref

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I opened a similar issue a while ago but for styles - #7063

Same thing happens with custom attributes btw, I'd expect this to give a "mismatched nodes" error at the very least:

No ref: https://codepen.io/anon/pen/qoExmb?editors=1010
With ref: https://codepen.io/anon/pen/oqgEWL?editors=1010

Text is fine though: https://codepen.io/anon/pen/OvPQQv?editors=1010

[yyx990803]

You should do it in mounted. Mutating state in created will be affecting the output in SSR so it would have no effect.

[KaelWD]

Why does it work with a ref then? This is basically the same as #7063 but with a different attribute.

[johnleider]

Is there a particular reason that #7063 qualifies as a bug but this does not?

[iranagame]

This issue still exist and has no workaround expect adding a ref to every single element which is not very elegant way!
Any ideas!?