Referenced HttpContext is not guaranteed to be valid.

[Vycka]

Log4Net.Async/src/Log4Net.Async/AsyncForwardingAppenderBase.cs

Line 30 in 122bfac

protected internal object HttpContext

Log4Net.Async/src/Log4Net.Async/ParallelForwardingAppender.cs

Line 200 in 122bfac

HttpContext = entry.HttpContext;

There are no guarantees that HttpContext is still gonna be valid when client closes connection.
And at least using it with heavy-loaded Kestrel it seems to be always the case and results logging not working at all.
There are also no guarantees that logging is gonna be used in environment where HttpContext even exists.
And HttpContext here seems to be only used for throwing exceptions and the need of it probably can just be removed.