CC Automation values not refreshed on screen

CC1 Modulation value stops refreshing since 664 measure (till the end of the project) as shown below (second automation lane). There is no specific data written in midi/cc - just what you can see on the attached video. Once I delete this automation part - the same problem appears randomly in other measures. (Automation works perfectly in all other 20 tracks). Interestingly the MIDI continues to send correct values - just values displayed are frozen…
(I’m using Cubase 11.0.30)