Nope, they aren't, but before you go all in to a panic mode, that is what can possibly happen.... Try the Chinese you have if it is a regular sized tube. Actually swap and troubleshoot with parts and pieces, when it fires several boxes with out a burp or fart, the problem has been resolved. If new problems crop up, we could/can go from there knowing what was tried, what worked or didnt work.
In my opinion, we can discuss problems and issues till blue in the face...but until it's in hand and things tried, tested and feedback is given, everything here is really is just a best guess based off our past experiances and what one remembers while firing and what seems to be semi vague or deflections of different troubles.
Owning 4 Romanians myself, I can say they are no less durable than any other, any SKS can suffer these issues be it a Russian, Chinese, Albanian or NVA or North Korean. Some rifles want some love before they will work, others will work great from the get go, and there are those that in the end are worth their weight in scrap.