The idea here is that a new option for /setblock will be added. This new tag will make the blocks you set disappear after a set amount of time. The name is work in progress, but I was thinking 'fade'. So the command would look like:
/setblock @p ~ ~1 ~ minecraft:dirt fade minecraft:glass 5
Basically, the idea is that the dirt block will be automatically replaced with glass after 5 seconds. If you build this with my original idea, it will look something like this:
/execute at @p run setblock @p ~ ~-1 ~ minecraft:dirt repeat 10 fade minecraft:air 2
This command will replace every block you walk on with dirt for 10 seconds, and every block that is placed this way gets replaced with air after two seconds. So it will look something like a bridge that builds in front of you and fades away behind you. This idea was made in mind for a skywars-like game I was making, and I think this would be a generally useful command for /setblock as well. I hope you like this!
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