[Bug 266669] net-mgmt/py-pysnmp: incompatibility with Python > 3.7

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266669

            Bug ID: 266669
           Summary: net-mgmt/py-pysnmp: incompatibility with Python > 3.7
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: ohartmann@walstatt.org
                CC: mhjacks@swbell.net
                CC: mhjacks@swbell.net
             Flags: maintainer-feedback?(mhjacks@swbell.net)

running several boxes with both most recent 14-CURRENT, 13-STABE and official
13.1-RELENG, I'm facing a problem utilizing port net-mgmt/py-pysnmp  (most
recent ports tree, of course) in combination with Python 3.9. 
I'm playing around with Python and port net-mgmt/py-pysnmp to diff into several
Cisco 4500 and 6000 type switches with a large amount of interfaces from which
I'd like to retrieve informations. So far, getching single OIDs via a tutorial
to be found here:

https://www.ictshore.com/sdn/python-snmp-tutorial/

I run into a serious problem and I think it's related to the fact
net-mgmt/py-pysnmp is only rated to be compatible with Python up to 3.7:
Our switches report more than 500 interfaces for the department and retrieving
at least 4 or 5 OIDs in a bulk request renders the bulkCmd to report crap
beyond the 315th interface requested. Means, fetching
ifIndex,ifDescr,ifInOctet,ifOutOctet,ifInErrors,ifOutErrors delivers on the
first two OIDs just mentioned previously (no matter what order they are sent
and retrieved) correct results, but with the 316th element, the OIDs starts to
shift into regions of the MIB I never requested for. 1-315 are as expected. I
checked on several FreeBSD flavours with no change of the behaviour as long as
I use Python 3.9 or Python 3.8 (I do not have a older FBSD at hand in the
network of question, nor do I have a Linux box there at hand, sorry).

The problem can be reproduced easily using recent FBSD, Python 3.9 and the
above mentioned port and targeting network equipment reporting more than 315
interfaces.

I'm new to Python, so be patient if this problem is a Noob's first-blood-error.

if one can confirm the observation and the observation reveals itself a true
bug, then there should be a warning since this may reveal  other serious
issues.

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