Changed class from lock to barb and rank 9 crimson behelit is missing. GM advised to post bug in order for logs to be checked.
Thus, kindly check.
Device Type: iPhone
Device Model: 17 pro max
Device Operating System: iOS 26.5.1
Diablo Immortal App Version: 5.0.3.36 (and lots of other numbers with no means to copy paste)
you posted enough of the numbers 
the first 4 are the key ones, something else to add to this would be
server
UID
both of which can be found bottom of settings
also a time frame of when you did the class change and noticed this
now do you have a pre existing loadout with the missing gem or is this the first time as barb? did you check your gear that it did not fail to transfer and is still in said gear?