It looks like this was noticed in the beta but is still happening in classic live right now.
https://us.forums.blizzard.com/en/wow/t/bug-frostfire-bolt-is-not-proccing-brain-freeze/1292545
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Just chiming in to note that I have noticed the exact same issue, hopefully it gets fixed. This can be pretty crucial to Frost’s mobility in PvP
As of today in wotlk classic the bug is still there and has not been fixed i was looking foward to a deep frost frostfirebolt spec but it is impossible to get decent result with that proc being missing.
As of start of phase 2 this issue is still not resolved.