I find Makecode Arcade very unreliable. Sooner or later we will lose random things, like a tilemap or a sprite. I find it very hard to use it anything more than a few hours of messing, you cannot take it seriously.
I have used it for a few years now with multiple laptops mostly with the downloaded software but also on a browser. I keep downloading it regularly in hope some update will fix the issue.
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I find that naming assets is a fix for this issue as even though the block will disappear, the asset remains in the assets tab
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