Some members are not displayed on destroying pools

[Juanma0x]

In a "destroying" nominating pool, the pool's root is unable to view the complete list of accounts that are still members of the pool and have not yet unbonded.

The behavior appears inconsistent, and the pool's status could be merely circumstantial.

Screenshots from pool #159:
Staking dashboard:

Subscan:
https://polkadot.subscan.io/nomination_pool/159

nominationPools.poolMembersresult is consistent with Subscan.

[rossbulat]

Just removed the Subscan API key to fall back tot their 2 calls /s per IP at #2184. I'll do some tests to check the member list behaviour and get back.