The plugin does not always underlines errors with curly line

[zyrikby]

It seems that sometimes the plugin does not always underline errors with curly lines in some parts of the documents, although the are listed in "Problems" panel. Interestingly, the warnings may be underlined with blue curly lines where the errors are not underlined. Moreover, in other parts of the same document, the errors are underlined.

Unfortunately, I cannot understand why this happens and what steps I need to make for reproducibility. Maybe, someone can tell me what should I do to provide more technical details for this issue report.