BUG: Can't load xref results

[stchris]

Describe the bug
On some datasets it's impossible to view crossreferencing results.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://aleph.occrp.org/datasets/7098#mode=xref
2. See error: We found 6864 results, but could not load them due to a technical problem. Please check back later and if the problem persists contact an Aleph administrator

Expected behavior
Xref results are shown.

Aleph version
3.15.2-rc2

The error was added in #2361