Since month I had severe issues with Code Completion / Code Insight / LSP. In particular, Code Insight stopped working in all Implementation sections. Here is the advice I received from TMS (Bruno Fierens)
With respect to code-insight, this is most likely caused by some code construct that isn't compatible with DCC32. Do you use any ASM blocks in your code? If this is at application level, to keep Code Insight happy, add such code in a block
{$IFNDEF WIN32}
ASM
....
END;
{$ENDIF)
I followed this advice and since then Code Insight is working again (for me). I hope this is helpful to others as well.
Thanks go to Bruno!