Hi,

I'm encountering a reproducible issue when testing the official ACM Digital Library translator using Zotero's Scaffold (Translator Editor).

The same ACM papers import successfully through Zotero Connector in Microsoft Edge, but running doWeb in Scaffold fails during ZU.itemFromCSLJSON().

ENVIRONMENT

OS: Windows (64-bit)
Zotero Desktop: 10.0.6 (64-bit)
Debug ID: D584471306

STEPS TO REPRODUCE

Open Scaffold (Translator Editor).

Load the latest official ACM Digital Library.js translator.

Navigate to:
https://dl.acm.org/doi/10.1145/3746059.3747617

Run doWeb.

The ACM citation API responds with HTTP 200 and valid JSON.

However, the translation fails with the following error:

TypeError: can't access property 2, fields[fieldID] is undefined

isBaseField@.../cachedTypes.js:151:9
itemFromCSLJSON@.../utilities_item.js:286:35
scrape@ACM Digital Library:173:5

ISOLATION TESTS

I selectively removed fields from the ACM CSL JSON before passing it to ZU.itemFromCSLJSON().

Results:

No fields removed: Error

Only original-date removed: Error

Only event-place removed: Error

Both original-date and event-place removed: Translation completes

This suggests that both fields can independently trigger the exception in Scaffold.

The behavior was also reproduced with another ACM paper:

https://dl.acm.org/doi/10.1145/3654777.3676379

EXPECTED BEHAVIOR

ZU.itemFromCSLJSON() should handle these CSL fields without throwing an exception, or gracefully ignore unsupported fields.

ADDITIONAL OBSERVATIONS

The same papers import successfully through Zotero Connector in Microsoft Edge.

Restarting Zotero did not resolve the issue.

Updating to the latest official ACM Digital Library translator did not resolve the issue.

The original translator exhibits this issue independently of my date normalization fix, which was merged in PR #3692:
https://github.com/zotero/translators/pull/3692

Could this be related to CSL field mapping in Scaffold's translation sandbox or Zotero Utilities?

Thank you!