bdk + esplora `update_local_chain` logic might be off

[danielabrozzoni]

See the discussion in #1151: #1151 (comment) (and following comments)

[evanlinjin]

@LagginTimes didn't you have a WIP progress PR to fix this? I remember we just needed to update the tests to "prove" the fix (which is waiting on the TestEnv.

[LagginTimes]

The PR #1145 fixed an electrum issue which seems to be unrelated to the esplora problem described here.

[evanlinjin]

I'm looking into this now!