Decals fading in with Fade Duration set to zero.
Found in 4.21 CL# 4753647, 4.22 CL# 7053642, 4.23 Preview 5 CL# 7838574
Results:
The decal will fade in even with no fade set
Expected:
The decal would not fade in
Workaround:
Set the Fade Duration to 0.01 and the decal will no longer fade in
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-78628 in the post.