Not quite what you may think given recent events.
So I logged onto my other account to do Uneasy Allies again and...my gorn engineers boffs, some of them at least, lost their trained abilities. They're simply gone. I had a similar issue happen on my main account, where a boff I had trained up lost all of what it had trained and reverted completely back to its original form. This hadn't happened to any other boff (yes they reverted, but they retained what they had previously). And it's only their ground abilities.
The latter happened when the revamped BOFF system came out, and the former happened with the release of this patch.
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