Can't create filter results macro

Summary

It is not possible to add a filter results macro to a page. The filter selection window simply doesn't load up. See attachment.

Environment

Confluence 1000.128.0

Steps to Reproduce

I've reproduced it on multiple prod instances.

1. Create a page
2. Try to add Filter Results macro - {filter results

Expected Results

To be able to select created filters.

Actual Results

Nothing gets logged. Nothing strange shows up in HAR files.
The saved filter window doesn't load up. It just shows a blank bordered window.