[Update: invalid due to misunderstanding of prior update announcement, waiting for mods to close issue]

According to https://www.minecraft.net/en-us/article/minecraft-snapshot-23w07a], suspicious sand is supposed to generate around desert temples and desert wells.

However, once finding a desert pyramid using the /locate structure command, no suspicious sand is in the area. This happens in a 23w07a world with all experimental data packs enabled.

I have a video showing that, but it is almost 2 minutes long and cannot be uploaded for exceeding the file limit set by the administrator. If the video is needed to reproduce the issue, please inform me of a different way of providing it.

Suspicious sand and the other new 23w07a features are shown in the creative inventory and can be used there.