I always have two flash drives attached to my laptop. They are set to automount at login in Removable Devices. This used to work at every login. But recently this stopped working, I'm just assuming this changed after the recent update.

Flash drives set to automount:
https://my.pcloud.com/publink/show?code ... Cuif1ce9j7

Devices NOT mounted at login:
https://my.pcloud.com/publink/show?code ... JhhLx8IMjy

Was this change on purpose, or is there something wrong?
From the Info Center I am now running KDE Plasma 5.12, with kernel 4.13.0-32 64bit.

Any ideas?

I'm having a similar issue. I will test it a bit more and report a bug if it will be continued

Looks like KDE Frameworks 5.43 update has broken automounting. Could be a packaging issue and Plasma might need to be recompiled. I'll test with latest git versions of KF5 and Plasma