My browser / operating system: ChromeOS 14541.0.0, Chrome 119.0.0.0, No Flash version detected

When I load a pre-made costume from the Scratch Library, the editor just… Crashes. The project will stop working, you won't be able to save, and the chosen costume won't even be added. I don't know if it's something with Scratch loading massive amounts of sprites at once, but it's a glitch.

when green flag clicked
think [I wonder why this glitch happens...]

How many sprites did you already have? How many costumes and sounds did you already have? If you only had a reasonable amount or fewer, try clearing your cache.

I'm not sure about the exact numbers, but it seems to happen more often on bigger and complicated projects, unsurprisingly.