lots of structures stand which are ghaznavid, the issue is not ''muslim army razing structures'', the issue is the weather and erosion problems in the sub continent especially in north india which doesnt let any brick monument stand for long time, comparatively the stones architecture of india has survived almost intact, there are several; ghaznavid tombs and shrines still standing in pakistan and gives a very good idea of the architecture from a period close to pre islamic sub continent, one such structure would be sadan shah's tomb. There are even buddhist stupas in sindh which are pre islamic and which probably survived because they are solid structures, there are also lots of unknown buildings from pre islamic era which need to be identified and conserved, i saw one video of a brick hindu temple from punjab south but was virtually unknown, there are even hindu shahi forts which are not conserved and deteriorating. As we go back far into timeline, the harder the chances of survival.There is something parallel, not exactly in Middle East, which I can cite. Once I listed all architectural/sculptural remains with their photos for Indian subcontinent (including Pakistan) century-wise for a research paper.
The pattern which emerged for Pakistan was surprising. First Islamic conquest in Pakistan was in 712 CE in Sindh. Complete Pakistan was conquered by Muslim kings by around 1200 CE, after which they made conquests in present-day India (there were only raids in India before c. 1200 CE).
In these 500 years from 712-1200 CE one can be sure than several Muslim monuments must have been built by the Muslim kings. However, today ruins/remains/structure of not even one monument from these 500 years are available. An exception is perhaps one rectangular platform made of stone-tiles / stones found near Thatta which Pakistan Archaeology Dept says is the first mosque which was built in c. 712 by Mohd Bin Kasim, the first conqueror of Pakistan. However, this identification is doubtful. It is not based on any archaeological evidence, just some statement as to where the mosque was said to have been built.
The point I am making is that till around 1200 CE, Islamic polity did not allow even Islamic structures of a competing Islamic sects or kings to stand.
Generalizing it, one can say that monuments lying in disuse were left untouched, but all existing/live monuments were razed in conquest. That is we find the items mentioned by @Frank81 in his post 11.
 First mosque in South Asia lies in ‘ruins’