Which package?

Encountered on [email protected], but reproducible on [email protected] and onwards

Describe the bug

After this commit it seems that React node chunks are being injected with hardcoded key props. This results in numerous warnings in the console etc.

Looks to be caused by toArbitrarilyKeyedReactNode here:
5709220#diff-3f3eca6b8934a329c2b948cf0c6aa17d25892fbc510accb92734ceb96a03a3e7R42-R46

To Reproduce

Make a source string like:

{
     "sourceString": "This is a react node value: {value}. And another react node {value1}"
}

And the use that message like:

<FormattedMessage id="sourceString" values={{ value: <b>node1</b>, value1: <b>node2</b> }} />

Codesandbox URL

https://codesandbox.io/p/sandbox/fqccvj (React)
https://codesandbox.io/p/sandbox/purple-leaf-85qgsq (Preact - what we use specifically)

as the messages are shown only in development builds, these are more just to give a better idea of the issue :)

Expected behavior

No duplicate keys among simbling nodes and no warning messages.

Screenshots

Desktop (please complete the following information):

• OS: MacOS
• Browser Google Chrome
• Version 134.0.6998.166