LPE Drop Down Menu "Flatten" causes Windows to go unresponsive for 2+ minutes but is instant if I do Path>Object to Path

Summary:

Compare the time it takes to do [Path>Object To Path] VS LPE Drop Down Menu "Flatten". In Windows, [Path>Object to Path] is almost instant.

However the LPE Drop Down Menu "Flatten" causes Windows to go unresponsive for several minutes.

The final results are the same.

Steps to reproduce:

• open Inkscape
• see attached file

What happened?

...

What should have happened?

Should take the same amount of time as Path>Object To Path

Sample attachments:

Version info

V1.4.2 Windows 11