There are more incipient problems. We've recently had an issue where some CCDs - readily available from China - work just as they're supposed to, but have some weird surface coating that causes interference effects. The up to date models, bought from a reputable distributor (e.g. Digikey et al) seem to work fine and look physically different.

It's not clear whether the ones you can buy on eBay or Aliexpress are simply older models (and the manufacturer then removed this coating), or are actually knock-offs. We have no way of really knowing.

It was a good lesson: most of the time it's just not worth it especially if you're not chasing pennies on your product margin.