Why does burning DVDs also degrade CD power? (drive from 2004)

pioneer
laser

#1

A DVD recorder from 2004 (Sharp DV-RW250 with DVR107/DVR-R07) recorded DVDs, especially DVD-RWs for many years.
Then, CD-RWs were not detected sometimes due to low reflectivity. But they played perfectly fine if detected.

Apparently, burning DVDs over time also affects CD laser power.