Technically: maybe. But the EU legislative process is very transparent (which is partially caused by the different legislative bodies that need to participate) and the European Parliament would probably not approve of such a hidden policy change.
Actually they did (in 2005) try to slip a vote on software patents in by scheduling it for an "Agriculture and Fishery" meeting. Luckily, they failed.
https://www.theguardian.com/technology/blog/2005/jan/23/eusd...
Could the EU copyright law be slipped in the same way?
[1] https://www.theregister.co.uk/2018/03/23/cloud_act_spending_...