Are there any server requirements for WordPress transients to work properly?

I had a similar problem once with an aggressive database cache: the first check for an existing transient returned nothing – which was okay – but after I created the transient, I didn’t get it, because the empty cached result was always returned. So I built a dozen duplicated transients until I found the issue.

Ask your clients if it happens after they disabled the data base cache. You could filter the 'query' and insert a SQL_NO_CACHE before you check the transient. Make sure to remove the filter afterwards.

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