Assuming the new Froglight blocks follow the same rules as other light source blocks, they should not be randomly rotated like sand or grass. However, they are in the beta.
MCPE-151514
Froglight blocks have random rotation
Resolved
Fixed
6
(Unassigned)
687941
Confirmed
Windows
Windows 10
1.18.20.24 Preview, 1.18.10.28 Beta, 1.18.10.27 Beta, 1.18.10.26 Beta
1.18.20.25 Beta, 1.18.30
Retrieved
Will set this to "confirmed" as the developers are considering this to be changed... https://twitter.com/wChiwi/status/1479231911889457152?s=20