Autoclaving certain plastics?
The list looks accurate. For example, the melting point of polypropylene ranges from ~130 C to ~160 C, so it's likely safe to autoclave.  Commercially available polyethylene melts ~100 -110 C, so is unsuitable for autoclaving.

Another common plastic, not listed above, polyethylene terephthalate (PETE), used for packaging and soft-drink bottles, softens below 100 C and is also unsuited for an autoclave.

Electrical and optical items used in endoscopic procedures are often heat-sensitive and cannot be autoclaved, posing difficulties in removing contamination.

As suggested, if you're unsure but must autoclave an item, place it in an open or perforated container so as to reduce risk of damage to the sterilizer.