Add a failing test for fixing

[eoghanmurray]

Bug report in #1457

This bug was caused by changes in #1431

Run the test on it's own as follows:

packages/rrweb-snapshot$ yarn retest --testPathPattern rebuild.test.ts -t tricky

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Latest commit: d864875ca0fe682c10943821b21e65e7d48f49ee

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[eoghanmurray]

I've isolated this failing css in a much smaller test case in #1481 which also fixes the issue