777 FLCH in climb and a/t going into HOLD, no low speed prot

[Houba]

Did anybody experienced this? And if yes, would you think that it could be a safety issue.

I've observed that upon engaging the FLCH during a climb and holding back the throttle they'll stop moving and the thrust mode annunciation is showing HOLD. Bottom line, you're sinking. The bad part about it is that even with the speed going into the foot with lowspeed alert, the autowake up of the autothrottle (low speed prot) is not engaging.

Thanks.