Please explain your feature request to the best of your abilities:

Falling blocks tend to persist through town regeneration.
Freezing block physics could help regeneration system process the chunks properly, since falling/moving blocks can fall to already regenerated sections and then stay there forever. Concrete powder, sand and gravel remain a constant nuisance in 'untouched' wilderness.

I previously reported this with also water spreading to regenerated chunks, but only the water physics were fixed for regeneration.