🚨 Error: this.win.document.head.querySelectorAll(...).forEach is not a function

Details
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**Error report:** [link](http://go/ampe/COfHi52dwrK17gE)
**First seen:** Apr 14, 2022
**Frequency:** ~ 20,097/day

Stacktrace
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Error: this.win.document.head.querySelectorAll(...).forEach is not a function

    at this (src/service/ampdoc-impl.js:357:21)

    at this (src/service/ampdoc-impl.js:385:20)

    at element (src/consent.js:118:43)

    at _this2 (src/custom-element.js:525:25)

Notes
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`@mdmower` modified `src/service/ampdoc-impl.js:345-358` in [#26687](https://github.com/ampproject/amphtml/pull/26687) (Feb 27, 2020)
`@mdmower` modified `src/service/ampdoc-impl.js:385-386` in [#26687](https://github.com/ampproject/amphtml/pull/26687) (Feb 27, 2020)
`@zhouyx` modified `src/consent.js:115-119` in [#20284](https://github.com/ampproject/amphtml/pull/20284) (Jan 15, 2019)
`@zhouyx` modified `src/custom-element.js:525-525` in [#15724](https://github.com/ampproject/amphtml/pull/15724) (Jun 7, 2018)

**Seen in:**
- 04-22 Stable (1712)

**Possible assignees:** `@mdmower`, `@zhouyx`

/cc @ampproject/release-on-duty