Currently dracut uses lvm.conf as found in the system and modifies only global/locking_type setting. As there's a new feature introduced - the lvmetad daemon, dracut should disable its use as well by setting "global/use_lvmetad=0"
(patch attached).

Otherwise, there's a warning message issued:

dracut: WARNING: Failed to connect to lvmetad: No such file or directory. Falling back to internal scanning.