The cessation of mural production in Penjikent was likely due to the invasion of the region by the Arabs in the 8th century. This event marked the beginning of the Islamic conquest of Sogdiana, which led to significant changes in the local culture and art, including the decline of the distinctive mural tradition that had flourished in Penjikent. The historical event of the Arab conquest had a profound impact on the region, leading to the end of the mural production that was once a hallmark of Penjikent's cultural heritage. For more detailed information, you can refer to the excavations led by A. M. Belehitskiy since 1952, which have brought to light many of the art masterpieces of Sogd, as mentioned in the source here.
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