Not able to save a Survey123 calculation field

[BenjamenWetherill]

This was working fine for me a couple days ago, but now I am not able to define a calculation in a Survey123 field. I am editing in the Survey123 website.

I have a field called 'Site Name' that I want to automatically populate based on another field called 'Site ID'. I'm using the calculation function to filter a layer file based on the Site_id attribute as in the screenshot below. It seems to work fine and I Save the form, but when I leave to the Overview screen and then return to the Design screen the calculation function is completely gone. It doesn't matter whether I publish or not. The calculation does not get saved. This was working fine a couple days ago. What could be wrong?

Edit: Note that this works fine if I create a new survey from scratch. Why can't I edit an existing survey?

[GlenterpriseUK]

Is the data in the same layer? You can use the Question as a Source

[BenjamenWetherill]

I'm not sure what you mean by the same layer. The site ID and site name are both in the WQ_Sites_All_Years_DB layer. The user enters site ID in another field. I want this field to return site name.

[BenjamenWetherill · Accepted solution]

I figured out what the issue is, and ESRI has confirmed that it is a bug. It is related to the Pages that I have in my survey. If I remove the Pages, then I am able to add the calculation to the Site Name field with no issues. Everything works fine when there are no Pages. After I have added the calculation, I am able to add back the Pages and the survey works fine for the end user. However, as soon as I add back the Pages I am no longer able to edit the calculation of any of the fields. The workaround until ESRI fixes the bug is to remove Pages, make your edits, and then recreate the Pages.