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....What mesh? You may have hit on the answer?
Here is a HP300BK XL (EU) / HP60BK XL (US) cartridge with the top and sponge removed. This was done to unclog the print head much in the same way you would treat a clogged separate Canon print head. The mesh/filter is similar to the ink inlet on a Canon print head. Its primary purpose is not to act as a filter but to act as a surface tension breaker to allow ink transfer to the print head. If the filter is punctured, it no longer acts as a surface tension breaker, and the cartridge cannot print.