While I was writing the bug report I found a workaround. I choose to report it anyway as it uses a rather obscure prime-select tool that I never knew about it even though I used optirun for years.

I had already played a few times on this setup using optirun to trigger the discrete card. Now it doesn't work anymore and I don't know what changed. Without optirun it runs fine on Intel but it's way slower.
If I try to run minecraft through optirun in either launchers (2.1.5965 or 1.6 jar version) I get the following error, before the game window shows up:

17:44:23.692 Checking installations.
17:44:23.693 Minecraft client 1.14.4 is ready to start.
17:44:23.693 Starting!
17:44:23.693 Nothing to download!
17:44:23.693 Extracting 7 files!
17:44:23.717 Using default game log configuration client-1.12.xml (outputs XML)
17:44:23.717 Installing versions!
17:44:25.837 Setting user: rber
17:44:32.047 LWJGL Version: 3.2.2 build 10
17:44:33.001 X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  72 (X_PutImage)
  Serial number of failed request:  46
  Current serial number in output stream:  54
17:44:33.001 Process crashed with exit code 1

The workaround I found was to explicitly select the nvidia card through the "prime-select" tool. I just ran prime-select nvidia and the game was able to run again.

I'll say again that prime-select is an obscure tool I've never heard of. Also after rebooting it broke the graphical terminal which rendered the system at least seemingly broken until I ran prime-select unset
I would love If I'm able to help making the game work out of the box in opensuse even in laptops with two graphic cards

Please close this bug.