Extremely slow and weird behavior when editing an SVG file in Designer

[eobet]

This file is incredibly slow to edit:

https://commons.wikimedia.org/wiki/File:2022_Russian_invasion_of_Ukraine.svg

Further, when I try to sort things into layers the way I want it, all objects become masks!

In fact, if I create a new empty layer, and add any object in it with this file open, it becomes a mask.

What's going on here?

[v_kyr]

Open it in a text editor, inspect the SVG code insight and you will pretty fast know. Also take a look how it is represented in a webbrowser instead.

This Inkscape based SVG file contains a bunch of XML + CSS dynamic styles, makes use of path-effects + filter internals and multi-language setups, thus a bunch of things Affinity's SVG parser doesn't support and thus doesn't know to interpret in the right manner. - So the Affinity SVG parser loads and shows all what it can "interpret/deal with" here more or less as a huge sort of placed mismatch!

[eobet]

Still doesn't really answer why all objects put into layers become masks, even in a new file while this document is open.

[v_kyr]

1 hour ago, eobet said:

Still doesn't really answer why all objects put into layers become masks, even in a new file while this document is open.

Show what and how you did that and then we probably can find out why. - Further it shouldn't affect new files as far as you didn't copied anything over then.