In the following example, the PDF compiles without error using xelatex:

Hello there. Do you know 𪆐 ?

The 𪆐 character, however, is missing in the PDF.

The log file shows:

Missing character: There is no 𪆐 in font [lmroman10-regular]:mapping=tex-text!

Why is this a warning and not an error?

closed as primarily opinion-based by Andrew Swann, Stefan Pinnow, Andrew, Mike Renfro, Werner Nov 1 '16 at 13:11

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.