Video Stream Size incorrectly calculated. Sometimes larger than the file size itself.

[iSAWaUFO]

Sometimes, a video stream size will be erroneously reported by the 'mediainfo -fullscan' (MacOS 10.14.5, Homebrew installation)
$ mediainfo --version
MediaInfo Command line,
MediaInfoLib - v19.09

In this example, the size of the file is ~152.2MB
but the size of the video stream is reported as ~419.9MB. That can't be correct!
$ ls -l
-rw-r--r--@ 1 ufo staff 152238289 Aug 21 22:33 video_stream_size_testcase.mkv

mediainfo -fullscan video_stream_size_testcase.mkv | grep 'Steam size'
Stream size : 419986088 (over 2.7x the size of the MKV file!)

Here is a test file, which exhibits the bug:
https://my.pcloud.com/publink/show?code=XZqfqo7ZAw3kHg5XtohxsUVnI9hHQzNDieo7

[iSAWaUFO]

I'm wondering if the problem may actually be with metadata embeded by the writing library,
Writing library : x265 - 2.3:[Windows][GCC 6.3.0][64 bit] 8bit
because if I remux the testcase video through MKVToolNix GUI v43.0.0 and check mediainfo -full of the remuxed video, the Video stream size reports a reasonable 124 MiB.
[I don't know if there's metadata for the stream size embedded in video of it it's entirely measured by the mediainfo utility.]