🚨 Error: startLayout called but not LAYOUT_SCHEDULED currently: 2

Details
---
**Error report:** [link](http://go/ampe/CO64h822haycOw)
**First seen:** Jun 2, 2021
**Frequency:** ~ 1,435/day

Stacktrace
---

Error: startLayout called but not LAYOUT_SCHEDULED currently:  2

    at message (src/core/error/index.js:59:22)

    at src/log.js:344:41

    at src/service/resource.js:867:6

    at callback (src/service/resources-impl.js:1346:30)

    at doWork (src/service/resources-impl.js:1697:6)

    at callback (src/core/data-structures/finite-state-machine.js:69:60)

    at this (src/service/resources-impl.js:665:42)

    at handler_ (src/pass.js:109:9)

    at pass_ (src/pass.js:55:11)

    at callback (src/service/timer-impl.js:79:8)

Notes
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`@rcebulko` modified `src/core/error/index.js:48-75` in [#33881](https://github.com/ampproject/amphtml/pull/33881) (Apr 16, 2021)
`@dvoytenko` modified `src/log.js:343-344` in [#2597](https://github.com/ampproject/amphtml/pull/2597) (Mar 15, 2016)
`@jridgewell` modified `src/service/resource.js:867-869` in [#29088](https://github.com/ampproject/amphtml/pull/29088) (Jun 30, 2020)
`@choumx` modified `src/service/resources-impl.js:1344-1347` in [#27684](https://github.com/ampproject/amphtml/pull/27684) (Apr 13, 2020)
`@jridgewell` modified `src/service/resources-impl.js:1696-1697` in [#1637](https://github.com/ampproject/amphtml/pull/1637) (Mar 18, 2016)
`@rcebulko` modified `src/core/data-structures/finite-state-machine.js:69-69` in [#34367](https://github.com/ampproject/amphtml/pull/34367) (May 14, 2021)
`@dvoytenko` modified `src/service/resources-impl.js:664-666` in [#1404](https://github.com/ampproject/amphtml/pull/1404) (Jan 12, 2016)
`@jridgewell` modified `src/pass.js:105-112` in [#3513](https://github.com/ampproject/amphtml/pull/3513) (Jun 9, 2016)
`@rsimha` modified `src/pass.js:50-56` in [#23559](https://github.com/ampproject/amphtml/pull/23559) (Jul 29, 2019)
`@rsimha` modified `src/service/timer-impl.js:73-81` in [#21212](https://github.com/ampproject/amphtml/pull/21212) (May 16, 2019)

**Seen in:**
- 07-09 Control (2322)
- 07-09 Stable (2322)
- 07-17 Beta (0150)
- 07-17 Experiment-B (0150)
- 07-17 Experimental (0150)
- 07-24 Nightly (0354)
- +1 more

**Possible assignees:** `@rcebulko`, `@jridgewell`

/cc @ampproject/release-on-duty