Pavlovia survey appears truncated in design tab but participant URL works fine

My supervisor has a survey on her pavlovia account that has been used in a previous project about one year ago, I think. It worked fine then, and the participant URL continues to present as expected and collect all data properly but in the design tab all but the first page is gone. This is true for both the edit windows and preview windows and the JSON code shows this also. But, as I say, when using the URL to share with participants all works fine, so there is clearly some mismatch here. I have copied the survey onto my pavlovia account and it all works in exactly the same way.
Does anyone have any idea what is causing this and how I can fix it?

If the issue can be replicated by sharing the JSON, please could you PM it to me and I’ll take a look.

Hi, thanks for your help. Copy pasting the JSON code produces only what would be expected of it, but copying the whole survey directly on pavlovia (i.e. select, copy) maintains the functionality while still somehow lacking much of the JSON code required for it. I’ve included what is left of the JSON code below. It keeps the title and first page but then just ends. When going through the participant share URL there are several pages after this (as there should be). Wherever these pages are stored it is somehow outside of the JSON code presented in its window on the design tab and accesible via the standard select, copy method of copying surverys.

{
“title”: “Vienna Art Interest and Art Knowledge”,
“pages”: [
{
“name”: “page1”,
“elements”: [
{
“type”: “text”,
“name”: “QID128”,
“title”: “Participant number:”,
“isRequired”: true
}
]
}
],
“showPageNumbers”: true
}