Probably not quite correctly search by tags. In this tag there are more than 300 topics.
Looked at other forums, the situation is similar.
v2.1.0.beta2 +382
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@maja can you investigate this issue?
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This has been fixed in:
https://github.com/discourse/discourse/commit/020eba46230c63795ae26890c7cb96d45548eab4
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