When Custom expression is connected to custom UV then material wont compile. This is working as expected in 4.22 CL# 7053642
Found in 4.23 CL#7321677 and 4.24 CL# 7321677
This is a regression.
The material will fail to compile with the error [SM5] /Engine/Generated/Material.ush(1873,18-46): error X3004: undeclared identifier 'CustomExpression0'
The material would compile
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-77716 in the post.