Metahumans UE5.4

Hi all! I work with Metahumans for cinematics, I edited custom metahumans in Blender following this video tutorial: https://www.youtube.com/watch?v=b_ZjsUg2XCc&t=1442s
and others similar to this video tutorial, everything worked out well and smoothly in UE5.3, in UE5.2, 5.1. But in UE5.4 it stopped working! The next time you export Metahuman from Blender to UE5.4 with a custom morph added, all morphs simply disappear! I don’t understand what’s going on! Yesterday I spent the whole day trying to solve the problem, I still couldn’t find a solution, thanks in advance for any help!