VS Code extension: Outline incomplete

Especially in longer documents, the VS code extension shows the outline only up to a certain point of the document. All further headlines are not recognised as such.

The problem is caused by paragraphs with nested lists, when using a a second indented list level. The problem is also visible when looking at the icons for collapsing paragraphs as in the following example:

The last icon the extension shows is in line 333. The headings in line 340 and 344 don't have one. And these headlines starting from this point down to the end of the document don't show up neither in the outline (the document has over 800 lines with many more headlines).

When I collapse the document using the icon in line 333, it collapses the complete rest of the document (not only the few lines belonging to that list).

Unfortunately, the problem is difficult to reproduce. It happens only in longer documents. So I haven't been able to make a MWE. And it isn't caused by every nested list. There are several nested lists above line 333, which work perfectly.

Unindenting the list items in lines 333 and 334 solves the problem as the following screen shot shows. Here the headlines in lines 340 and 344 are identified as headlines (and have therefore an icon to collapse them):

No source files, tests, or entry points are named. Start by reproducing the issue in the VS Code extension with a long document containing nested lists, then inspect outline and folding behavior around the problematic list; done means later headings appear in the outline and collapsing that list does not collapse the rest of the document.