API v2 and some strange issues with WP 6.9 RC

[JiveDig]

I'm sorry for a vague issue here, but wanted to get it on the radar since WP 6.9 is getting released within the next few days, if not tomorrow.

While testing 6.9 RC (4 right now), the filters show a warning for API version 2.

Also, my posts don't render with the full styling when I filter.

Many times, the posts don't filter at all. It shows "X results" but nothing changes, and no errors in the console. Strange.

It all works fine on 6.8.3.

[JiveDig]

Here are the errors I'm seeing on 6.9. This is with the search block in the Query Loop.

debug.js?ver=c88277fef077071034f8:282 The value of data-wp-context on the query-filter namespace must be a valid stringified JSON object.
warn @ debug.js?ver=c88277fef077071034f8:282
debug.js?ver=c88277fef077071034f8:282 Using the synchronous event.preventDefault() function in a store action without wrapping it in withSyncEvent() is deprecated and will stop working in WordPress 7.0. Please wrap the store action in withSyncEvent().