Unable to add more than 40 items in Repeater

[dull iris]

I am using a repeater to add invoice items. Invoice items are heavy because they also have a repeater inside for lots. When items are 40+, I am unable to add more. An error notification "Error while loading page
There was an error while attempting to load this page. Please try again later."

I am not adding items inline using default behavior of repeater, but I have a section with a footer action "Add item to Invoice" and this action is putting the item inside read-only repeater.

[cosmic swan]

Possibly max input vars or size of the request, look into the trigger of the error, you'll need to use telescope or debugbar or similar to inspect the server failure to cause that error