This query worked because you filtered the field “Testtag” with the command contains(): without quotation [[Test]] is read as a string and, with contains, the filter checks if “Teste” is a substring (i.e., inside) the string.
If you have this in other note…
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Testtag: This is a Test
---
the filter selects this note as well… or “Testtag: [[This is another Test]]”…
Without quotation the field is read as a string and the results may not be the desired.
True amigo, I just tried that and it worked just like you said, darn, I thought I had a work around on my hands. Thank you for showing me this issue, this could be a real filter problem. I think I am going to go with your method too now.