TransitionGroup: error on next update after standalone child (not v-for) was removed

[jonaskuske]

Version

3.0.0-beta.6

Reproduction link

https://codepen.io/21stCenturyJonas/pen/LYpOEEK

Steps to reproduce

1. Click Remove "Three"
2. Click Shuffle
3. Check console

What is expected?

The remaining items ("One" and "Two") are shuffled and rendered.

What is actually happening?

TypeError: child.el.getBoundingClientRect is not a function
    at Proxy.<anonymous> (vue.esm-browser.js:10946)
    at renderComponentRoot (vue.esm-browser.js:5010)
    at componentEffect (vue.esm-browser.js:7809)
    at reactiveEffect (vue.esm-browser.js:3977)
    at callWithErrorHandling (vue.esm-browser.js:4815)
    at flushJobs (vue.esm-browser.js:4957)

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Removing items from a list that's rendered via v-for works as expected, the error happens only if the removed node was "standalone".