Myasishchev research destroyed?

[World B4]

I've seen a few claims from not exactly ironclad sources that the Soviet government destroyed some Myasishchev spaceplane design(s) and research. I'd like to know if this really happened, and if we know the scope and summary of what was lost if it did.
Example of the claim

M-46/M-48 (VKA-23): The First Soviet Spaceplane

What it was: Four interrelated, but different, designs for a small Soviet spaceplane. While almost all Russian spacecraft descend from Sergei Korolev’s R-7 and Vostok, they began as an indepe…

falsesteps.wordpress.com

Though the early Myasishchev spaceplane designs were paper only and limited in scope, they are considered "secret projects", the uncertainty of the alleged actions of the state are what makes the topic suitable fore this forum imo

 

[publiusr]

I hope not…