Cyrillic SVG support is broken in 5.6

[xorred]

Cyrillic SVG support is broken.
UTF and ASCII svg file names works just fine.

Example: try to upload this file to any media library on any WordPress installation:
​https://atlantsecurity.com/wp-content/uploads/2020/12/подготовка-аудит-ит-безопасности.svg

It uploads fine, but does not display in Media. Also, when you try to insert it into a page or post, it inserts only word 2 and 3 from the file name.
If you rename the same file to file.svg (ascii english) - it displays just fine, gets inserted just fine.

Example
word1-word2-word3.svg

You try to insert it, it inserts word2-word3.svg only and the result is a broken image link.

The file however is in the library, you can access it as the example I gave above.

[lukecarbis]

@xorred Thanks for reporting this. I just tried replicating the problem in WordPress 5.6, but I had no problem uploading the file you linked to.

I was using a plugin called Safe SVG to enable SVG uploads – perhaps the issue is related to the method you use to enable SVGs?

[xorred]

Could it be because you use Apache and I use Litespeed?

My concern is that it worked perfectly fine for almost a year and then stopped after the latest WordPress upgrade. I use the same plugin