I haven't touched my setup in months and after a recent KLCK update my blurred shapes just turn out opaque on my actual lock-screen even though they show just fine in the KLCK preview:
Ignore the changed color, I use color randomization.
I don't have any issues in KLWP, it's just KLCK that's affected but I found a post on Reddit from another user that had the same problem in KLWP: https://www.reddit.com/r/kustom/comments/de7j66/does_this_happen_to_anyone_else_i_have_the_shape/
I'm running KLCK Pro 3.42b927314
My device is a Xiaomi Mi 8 running MIUI 10.3.5 Stable, Android 9PKQ1.180729.001 and the problem manifested between the last 1-2 weeks. I already tried rebooting my phone, clearing the KLCK cache and reapplying my preset, nothing helps.