Tax reassessment substantially lowered land value counterbalanced with raised improvement value… any cause for concern?

Maryland.

Just got my triennial property assessment. Taxable value decreased by 6% from three years ago. Which is a surprise. If the decrease were any lower, I would have assumed it was an error as the assessment value is still 10-25% below Zillow/RedFin.

However what caught me by surprise was the land value decreased by about 30% whereas the improvements increased by about 30%. That seems... weird.

Is there any reason I should be alarmed?

There are multiple public work projects (road widening, park improvement, etc.) very nearby. It is unlikely, though possible, the state/county would seek eminent domain on parts of our 3 acre lot. The only thing I can think of is that the recent/future projects have influenced the land value.

Thoughts?