Thanks for digging in further and narrowing it down. I will analyze to see what is the
reason, like the references to the buffers become invalid as the needs for
defines/substdefs can exceed/overwrite them. It is interesting that it didn't surface
for defines which had this kind of capability/behaviour for long time before, the commit
referenced above extended for substdef to make it coherent, because this one makes a
define behind.
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