Data Import not Analysing all Lines Present in Document

Recently I have tried to import a json file to test the visualization feature. In Visual Studio, I see that the file reaches 954 lines in length.

I have noticed, however, that when imported the lines of text at the end of the JSON document are missing.

I imported regardless to see what would happen, and it results in some documents not being imported by the visualizer due to GROK patterns not matching (which I personally attribute to the missing lines of text).

Any tips on what I should do?