Summary:

The Suspicious Sand does not turn to Sand after you have finished brushing it in Bedrock Edition.

Steps to reproduce:

1- Find a place where you find the Suspicious Sand (The Desert Pyramid or the Desert Fountain)

2- Once you find a Suspicious Sand, brush it.

Observed results:

You will see that after you finish brushing it it disappears

Expected results:

The Suspicious Sand should turn into Sand after you're done brushing it, just like in the Java edition.