In naval RB, when I respawn with HMAS Fremantle (British coastal 3.0 in RB), I cannot lock on anyone. The lock function is usable when I start with HMAS Fremantle from the beginning of one single match, but the bug shows up when I respawn with this boat. This bug does not always show up, but it still occurs quite often.
It seems that someone also encounters a similar bug on Flaggstaff. I’m not sure if any other boats have this problem.
You can bug report it here (just search a bit first so that you don’t report something that is already reported and known about): (Gaijin.net // Issues)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)