"Under election law, the term “suspend” has no formal meaning. The Federal Election Commission still considers candidates who have suspended their campaign to be running. The FEC won’t formally recognize the termination of a campaign until candidates have paid off all of their debts and obligations and agree not to receive any more contributions. Until then, the candidate is still running and will still appear on ballots."

Bern did not terminate with the FEC...excerpt from his April 8th speech suspending his campaign

"On a practical note, let me also say this: I will stay on the ballot in all remaining states and continue to gather delegates. While Vice President Biden will be the nominee, we must continue working to assemble as many delegates as possible at the Democratic convention, where we will be able to exert significant influence over the party platform and other functions."

^^^ no clandestine nefarious sneak attack here

More directly to your question

States typically do not cancel their primaries after every candidate but one drops out. Democrats held their regularly scheduled primaries in 2000 and 2004 even after opponents of eventual nominees Al Gore and John Kerry left the race. Republicans held their primaries in 2000, 2008, 2012 and 2016 …

Sorry, can't swipe the whole thing, it's a wapo article

But there is precedent for primaries continuing and candidates staying on the ballot after suspending.