Running 0.6.1 without netmonitor misses content size for some responses

[soulgalore]

Hi @janodvarko
with the latest version 0.6.1 it works without choosing to enable the netmonitor tab. By works I mean you get the HAR. But it seems like the HAR misses content size for some responses. Here's one example:
https://gist.github.com/soulgalore/19f68eeee12f20fce45d1ba1995ff8a7

log.entries[0].response.content.size

If I enable the netmonitor tab, I cannot reproduce it. I tried a couple of other URLs and the same result (one or more responses misses the content size field).

Best
Peter