[Tin] Newer versions falsely show empty groups

I've long used Tin 2.0.1 but I noticed that newer versions
download less data when entering busy groups (without compression),
so I've been trying 2.6.4 (built from source). But with the NNTP
server I use for Usenet (running DNews) some groups that have
articles shown in 2.0.1 are empty in 2.6.4 (same with 2.6.2
installed from a Debian package on a different PC).

Curiously it sometimes depends on the getart_limit setting. With
"getart_limit=500" I can see articles in alt.bitcoins, but with
"getart_limit=1000" it opens empty, with "*** No articles ***" at
the bottom (normally the view stays on the group list while that
message displays for genuinely-empty groups). Same with
comp.infosystems.gemini, comp.os.misc, and various other
low-traffic groups.

But some groups show up empty in 2.6.4 with "getart_limit=500" or
"getart_limit=1000", eg. ibm.ibmpc.thinkpad. But articles are
always shown in Tin 2.0.1 with either setting.

I also tried setting "cache_overview_files=ON"* and running
"tin -u -r -v" first. But I get the same behaviour except that the
second time I try to view one of these falsely-empty groups Tin
stays on the group list while displaying "*** No articles ***".

I tried renaming ~/.tin/filter to ~/.tin/filter.disabled and
changing "kill_level=2" to "kill_level=1" in case the filtering was
going wrong, but no difference.

I've diffed ~/.tin/tinrc between the three versions (newer ones
were generated from my 2.0.1 config.), but don't see any relevant
differences.

Is there a new setting that I should change to work with DNews
servers? Or is this a bug?


* I thought this might further reduce download sizes when entering
  groups, but it appears not.

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