In the soviet union and its sphere conservatism was in general a thing even before the various revolutions. For a very long time (read even now among the older generation of scholars) LGBTQ issues were/are considered mental illness or decadence brought on by capitalism. In the meantime it was difficult for any movement for such rights to take hold because it would be suppressed in no times, due to its potential ties to the west, and to what was seen as stemming from a very bad moral character. Basically, in this regard the Eastern European and soviet part of the world was pretty reactionary and that stunted the development on the topic in that part of the world