In the following example (which doesn't give a valid pdf, it is only
for demo) the logging has changed between texlive 2018 and 2019:

In texlive 2018 the log said:

...\pdfliteral page"/Artifact /BMC"

In texlive 2019 I now get

...\pdfliteral page <lua data reference 770>

This sadly means that my testsuites are no longer really meaningful.

Is there a way to get the old behaviour back? Or to somehow add the
content of the "<lua data reference 770>" to the log?