Basically, when I kill an Enderman, nothing drops. And I know that Endermen don't always drop pearls, but when you kill around 22 in Survival mode and nothing happens, I think it's safe to say that there's a bug. I went into Creative mode and spawned tons of Endermen & killed them all with a Looting III Diamond Sword and I got no pearls. I even tried Endermites and nothing happened.
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It could be.
[Mod] Celesian
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-35307.
Please add a vote and any new information to the main ticket, which will be updated accordingly.
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Additionally only endermen drop enderpearls
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I'd say it's just a streak of bad luck, keep trying. If nothing changes, then it's a bug. Good luck!