Rover v4.2beta3 MP reading logs problem

Reading logs with MP from a particular balance bot with Rover v4.2beta3 such as this I get:


After that it keeps scanning for ever.

However it is readable with APM Planner 2 and on http://plot.ardupilot.org.

MP 1.3.77 build 1.3.8129.8778.

Solved immediately in MP 1.3.77 build 1.3.8132.14584 (issue).