The earliest version of this part was manufactured with ABS and is hard and rigid.
Colors known to have ABS versions are white, red, and pearl light gray.
To add: yellow. I just received 2 of them
[...] Unless you just pulled them straight out of a sealed set, the note will not be updated. As far as we know, the rigid part was only used for the first couple of years [...] (1 month ago, May 4, 2024, to Catalog Requests)