Can't access context.document.customXmlParts in Word for iPad

[FelipeCostaGualberto]

It seems there's an issue with when calling context.sync() in Word for iPad when

• acessing .load("items/id") of a context.document.customXmlParts.
• acessing .getXml() of context.document.customXmlParts.getItem.

Your Environment

• Platform: iPad Air (3rd generation)
• Host: Word
• Office version number: 2.95.25031036
• Operating System: iOS 18.3.2

Expected behavior

It is expected that I can acess Custom XML Parts in Word. The very same manifesto/app sucessfully loads, access and updates Custom XML Parts in Word for Desktop, Word Online, Word for Mac.
Also, it works correctly in every Excel version (including iPad) and every PowerPoint version (except iPad, because it doesn't have the required requirement set, but that it is expected).

Current behavior

When trying to acess Custom XML Parts in Word for iPad, I get the exception RichApi.Error.

Steps to reproduce

Since ScriptLab doesn't work on iPad, create (and deploy) a minimal Office Addins with this script and test it in Word for iPad:

$("#run").on("click", () => tryCatch(run));

async function run() {
  await Word.run(async (context) => {
    // This doesn't work in Word for iPad.
    const partsCollection = context.document.customXmlParts;
    partsCollection.load("items/id");
    await context.sync();
    
    console.log(partsCollection);
  });
}

async function tryCatch(callback) {
  try {
    await callback();
  } catch (error) {
    console.error(error);
  }
}

Context

I need to subit an Add-in that manages Custom XML Parts for Word to the Office Store, and this could be a barrier for the Add-in approval.

Useful logs

Screenshot:

[microsoft-github-policy-service]

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