Guess I spoke too soon. Problem still persist. I have updated to PrusaSlicer 2.3 as suggested by @Veti. No difference I cannot understand why it worked in firmware version 2 and not in 3.
Oh well, have to live with it.
Ok, now I am flummoxed, restarted Repetier host and sliced a new part using slic3r, now the layer chart is working! The job information box now has the correct information.
@matt3o - the coded generated already has a comment " ;layer_height = 0.3" this comment was also present in the "non working" code.
Thanks for all the comments.!
I have just upgraded ReprapFirmware from version 2.xxx to 3.2 (2020-01-05), DWC 3.2.0, WiFi Server 1.25. I made all the changes to config.g. the printer is performing as before.
However, the layer chart stays blank, the first layer time is the same as the total print time.
The layer chart worked perfectly in the 2.XX version. I am using Slic3r 1.3.0 as before, nothing changed here.