Issue not observed in mechjeb 2.0.x and is new in 2.1.1

when two approaching craft (<10m, <1m/s), both set to TGT+, both crafts will wobble and intensify instead of stabilizing themselves

if one is set to the in game SAS-on, while the other craft set to TGT+, the TGT+ one will still wobble and intensify while closing in (<5m)

confirmed to be not a CoM issue, with very sufficient SAS torque and with snap-fitted docking port

Closing this as an old MechJeb issue. Many MechJeb issues have had little interest in years, have been fixed for years, do not include adequate replication steps, refer to old problems which are no longer applicable, or are difficult to determine what the problem is. This issue is being closed for one of those reasons. We apologize for any inconvenience, but keeping the TODO list tidy helps the developers.

If this bug/issue is still a problem, please open a new issue. For bugs please try to include a Minimal, Complete, Verifiable Example that explains all the steps required to replicate the issue. A link to the KSP.log file should be ideally included, but is often not sufficient information. Screenshots or short videos are often the best way to show a bug.

(This may be solved by improvements to the attitude controller including the hybrid attitude controller)