[Bug]: recordCrossOriginIframes: true does not work with pack/unpack fn

[thatsnotright]

Preflight Checklist

• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

What package is this bug report for?

rrweb

Version

latest from master

Expected Behavior

I expect recordCrossOriginIframes will show iframe content when injected in to all iframes, with a pack/unpackfn specified.

Actual Behavior

The mutations are captured for iframes but not processed unless I remove the packFn. If I specify a packFn for only the top-level rrweb this also works, so it's just in the child to parent messaging that the packFn causes this behavior.

Steps to Reproduce

Use the repl to get an IFrame site, and then add a packFn and see that it no longer renders cross-domain IFrame content.

I have an idea where to fix this that I'm looking at locally and I can submit a PR if I fix this behavior before anyone else does.

Testcase Gist URL

No response

Additional Information

No response

[Juice10]

Looks like rrweb should disable packing out of the box for inter-iframe communication, then you wouldn't bump into this issue