I tried depositing my SBD to Poloniex the other day but it didn't went through as I thought they have resumed the SBD deposits because they've enabled it on their website.
Sad to say I did the 2 deposits for SBD. XD
I've checked again on their website and they gave an ETA on when SBD deposits and withdrawals will resume.
SBD deposits and withdrawals are currently estimated to resume by 08:00 UTC on July 1st.
I'm hopeful that they will also be able to fix those deposits and withdrawals that already went through their system.