a) Samsung spent a ton of money and research in building foldable OLED screens.
b) This technology is allegedly stolen by a supplier and sold to BOE Display: https://asia.nikkei.com/Business/Companies/Samsung-supplier-...
c) Huawei uses the foldable BOE Display technology in its Mate X smartphone and is on track to be the first to release it.
d) Samsung panics as it learns that the technology it built might be released by a competitor earlier than them and consumers might think of them as less of an innovator. May sound silly but the Chinese companies have been getting a lot of traction recently e.g. P30 Pro.
e) In addition Samsung goes into lock down as it fears there might be more leaks to other companies.
f) Combination of d) and e) means that there is less real world testing of the device than for other phones. And hence how we got to this point.